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Finding the Fourth Proportional to 9,359, 12,915.42 and 5,167.28

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Solution

The fourth proportional to 9,359, 12,915.42 and 5,167.28 is: 7,130.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,359 : 12,915.42 = 5,167.28 : x
  2. Step 2: Convert to fraction form
    9,359/12,915.42 = 5,167.28/x
  3. Step 3: Cross multiply
    9,359x = 12,915.42 × 5,167.28
  4. Step 4: Simplify right side
    9,359x = 66,737,591.46
  5. Step 5: Solve for x
    x = 66,737,591.46/9,359
  6. Step 6: Final answer
    x = 7,130.85

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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.