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Finding the Fourth Proportional to 21,287, 31,931.04 and 7,436

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Solution

The fourth proportional to 21,287, 31,931.04 and 7,436 is: 11,154.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287 : 31,931.04 = 7,436 : x
  2. Step 2: Convert to fraction form
    21,287/31,931.04 = 7,436/x
  3. Step 3: Cross multiply
    21,287x = 31,931.04 × 7,436
  4. Step 4: Simplify right side
    21,287x = 237,439,213.44
  5. Step 5: Solve for x
    x = 237,439,213.44/21,287
  6. Step 6: Final answer
    x = 11,154.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.