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Finding the Fourth Proportional to 1,265.24, 1,897.87 and 387.74

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Solution

The fourth proportional to 1,265.24, 1,897.87 and 387.74 is: 581.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.24 : 1,897.87 = 387.74 : x
  2. Step 2: Convert to fraction form
    1,265.24/1,897.87 = 387.74/x
  3. Step 3: Cross multiply
    1,265.24x = 1,897.87 × 387.74
  4. Step 4: Simplify right side
    1,265.24x = 735,874.40
  5. Step 5: Solve for x
    x = 735,874.40/1,265.24
  6. Step 6: Final answer
    x = 581.61

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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.