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Finding the Fourth Proportional to 730.49, 1,007.63 and 631.31

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Solution

The fourth proportional to 730.49, 1,007.63 and 631.31 is: 870.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.49 : 1,007.63 = 631.31 : x
  2. Step 2: Convert to fraction form
    730.49/1,007.63 = 631.31/x
  3. Step 3: Cross multiply
    730.49x = 1,007.63 × 631.31
  4. Step 4: Simplify right side
    730.49x = 636,118.70
  5. Step 5: Solve for x
    x = 636,118.70/730.49
  6. Step 6: Final answer
    x = 870.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.