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Finding the Fourth Proportional to 1,124.71, 1,686.99 and 431.35

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Solution

The fourth proportional to 1,124.71, 1,686.99 and 431.35 is: 646.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.71 : 1,686.99 = 431.35 : x
  2. Step 2: Convert to fraction form
    1,124.71/1,686.99 = 431.35/x
  3. Step 3: Cross multiply
    1,124.71x = 1,686.99 × 431.35
  4. Step 4: Simplify right side
    1,124.71x = 727,675.78
  5. Step 5: Solve for x
    x = 727,675.78/1,124.71
  6. Step 6: Final answer
    x = 646.99

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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.