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Finding the Fourth Proportional to 1,124.28, 1,686.36 and 431.28

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Solution

The fourth proportional to 1,124.28, 1,686.36 and 431.28 is: 646.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.28 : 1,686.36 = 431.28 : x
  2. Step 2: Convert to fraction form
    1,124.28/1,686.36 = 431.28/x
  3. Step 3: Cross multiply
    1,124.28x = 1,686.36 × 431.28
  4. Step 4: Simplify right side
    1,124.28x = 727,293.34
  5. Step 5: Solve for x
    x = 727,293.34/1,124.28
  6. Step 6: Final answer
    x = 646.90

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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.