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Finding the Fourth Proportional to 15,870.85, 21,900.23 and 8,797.12

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Solution

The fourth proportional to 15,870.85, 21,900.23 and 8,797.12 is: 12,139.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.85 : 21,900.23 = 8,797.12 : x
  2. Step 2: Convert to fraction form
    15,870.85/21,900.23 = 8,797.12/x
  3. Step 3: Cross multiply
    15,870.85x = 21,900.23 × 8,797.12
  4. Step 4: Simplify right side
    15,870.85x = 192,658,907.35
  5. Step 5: Solve for x
    x = 192,658,907.35/15,870.85
  6. Step 6: Final answer
    x = 12,139.17

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.