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Finding the Fourth Proportional to 1,124.90, 1,686.18 and 431.39

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Solution

The fourth proportional to 1,124.90, 1,686.18 and 431.39 is: 646.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.90 : 1,686.18 = 431.39 : x
  2. Step 2: Convert to fraction form
    1,124.90/1,686.18 = 431.39/x
  3. Step 3: Cross multiply
    1,124.90x = 1,686.18 × 431.39
  4. Step 4: Simplify right side
    1,124.90x = 727,392.76
  5. Step 5: Solve for x
    x = 727,392.76/1,124.90
  6. Step 6: Final answer
    x = 646.63

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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.