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Finding the Fourth Proportional to 15,866.80, 21,895.42 and 9,154.59

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Solution

The fourth proportional to 15,866.80, 21,895.42 and 9,154.59 is: 12,632.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,866.80 : 21,895.42 = 9,154.59 : x
  2. Step 2: Convert to fraction form
    15,866.80/21,895.42 = 9,154.59/x
  3. Step 3: Cross multiply
    15,866.80x = 21,895.42 × 9,154.59
  4. Step 4: Simplify right side
    15,866.80x = 200,443,715.64
  5. Step 5: Solve for x
    x = 200,443,715.64/15,866.80
  6. Step 6: Final answer
    x = 12,632.90

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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.