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Finding the Fourth Proportional to 15,870.16, 21,901 and 8,796.80

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Solution

The fourth proportional to 15,870.16, 21,901 and 8,796.80 is: 12,139.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.16 : 21,901 = 8,796.80 : x
  2. Step 2: Convert to fraction form
    15,870.16/21,901 = 8,796.80/x
  3. Step 3: Cross multiply
    15,870.16x = 21,901 × 8,796.80
  4. Step 4: Simplify right side
    15,870.16x = 192,658,716.80
  5. Step 5: Solve for x
    x = 192,658,716.80/15,870.16
  6. Step 6: Final answer
    x = 12,139.68

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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.