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Finding the Fourth Proportional to 15,681.69, 21,639.42 and 8,965.17

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Solution

The fourth proportional to 15,681.69, 21,639.42 and 8,965.17 is: 12,371.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.69 : 21,639.42 = 8,965.17 : x
  2. Step 2: Convert to fraction form
    15,681.69/21,639.42 = 8,965.17/x
  3. Step 3: Cross multiply
    15,681.69x = 21,639.42 × 8,965.17
  4. Step 4: Simplify right side
    15,681.69x = 194,001,079.00
  5. Step 5: Solve for x
    x = 194,001,079.00/15,681.69
  6. Step 6: Final answer
    x = 12,371.18

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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.