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Finding the Fourth Proportional to 672.31, 1,007.80 and 617.64

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Solution

The fourth proportional to 672.31, 1,007.80 and 617.64 is: 925.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.31 : 1,007.80 = 617.64 : x
  2. Step 2: Convert to fraction form
    672.31/1,007.80 = 617.64/x
  3. Step 3: Cross multiply
    672.31x = 1,007.80 × 617.64
  4. Step 4: Simplify right side
    672.31x = 622,457.59
  5. Step 5: Solve for x
    x = 622,457.59/672.31
  6. Step 6: Final answer
    x = 925.85

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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.