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Finding the Fourth Proportional to 1,124.87, 1,686.63 and 431.59

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Solution

The fourth proportional to 1,124.87, 1,686.63 and 431.59 is: 647.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.87 : 1,686.63 = 431.59 : x
  2. Step 2: Convert to fraction form
    1,124.87/1,686.63 = 431.59/x
  3. Step 3: Cross multiply
    1,124.87x = 1,686.63 × 431.59
  4. Step 4: Simplify right side
    1,124.87x = 727,932.64
  5. Step 5: Solve for x
    x = 727,932.64/1,124.87
  6. Step 6: Final answer
    x = 647.13

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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.