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Finding the Fourth Proportional to 15,870.80, 21,901.66 and 8,797.21

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Solution

The fourth proportional to 15,870.80, 21,901.66 and 8,797.21 is: 12,140.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.80 : 21,901.66 = 8,797.21 : x
  2. Step 2: Convert to fraction form
    15,870.80/21,901.66 = 8,797.21/x
  3. Step 3: Cross multiply
    15,870.80x = 21,901.66 × 8,797.21
  4. Step 4: Simplify right side
    15,870.80x = 192,673,425.62
  5. Step 5: Solve for x
    x = 192,673,425.62/15,870.80
  6. Step 6: Final answer
    x = 12,140.12

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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.