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Finding the Fourth Proportional to 5,287.38, 7,931.52 and 1,391.76

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Solution

The fourth proportional to 5,287.38, 7,931.52 and 1,391.76 is: 2,087.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.38 : 7,931.52 = 1,391.76 : x
  2. Step 2: Convert to fraction form
    5,287.38/7,931.52 = 1,391.76/x
  3. Step 3: Cross multiply
    5,287.38x = 7,931.52 × 1,391.76
  4. Step 4: Simplify right side
    5,287.38x = 11,038,772.28
  5. Step 5: Solve for x
    x = 11,038,772.28/5,287.38
  6. Step 6: Final answer
    x = 2,087.76

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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.