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Finding the Fourth Proportional to 431.04, 642.72 and 425.76

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Solution

The fourth proportional to 431.04, 642.72 and 425.76 is: 634.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.04 : 642.72 = 425.76 : x
  2. Step 2: Convert to fraction form
    431.04/642.72 = 425.76/x
  3. Step 3: Cross multiply
    431.04x = 642.72 × 425.76
  4. Step 4: Simplify right side
    431.04x = 273,644.47
  5. Step 5: Solve for x
    x = 273,644.47/431.04
  6. Step 6: Final answer
    x = 634.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.