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Finding the Fourth Proportional to 1,265.78, 1,898.33 and 432.83

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Solution

The fourth proportional to 1,265.78, 1,898.33 and 432.83 is: 649.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.78 : 1,898.33 = 432.83 : x
  2. Step 2: Convert to fraction form
    1,265.78/1,898.33 = 432.83/x
  3. Step 3: Cross multiply
    1,265.78x = 1,898.33 × 432.83
  4. Step 4: Simplify right side
    1,265.78x = 821,642.52
  5. Step 5: Solve for x
    x = 821,642.52/1,265.78
  6. Step 6: Final answer
    x = 649.12

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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.