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Finding the Fourth Proportional to 15,931.38, 21,978.99 and 9,215.76

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Solution

The fourth proportional to 15,931.38, 21,978.99 and 9,215.76 is: 12,714.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,931.38 : 21,978.99 = 9,215.76 : x
  2. Step 2: Convert to fraction form
    15,931.38/21,978.99 = 9,215.76/x
  3. Step 3: Cross multiply
    15,931.38x = 21,978.99 × 9,215.76
  4. Step 4: Simplify right side
    15,931.38x = 202,553,096.88
  5. Step 5: Solve for x
    x = 202,553,096.88/15,931.38
  6. Step 6: Final answer
    x = 12,714.10

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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.