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Finding the Fourth Proportional to 663.92, 990.40 and 631.52

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Solution

The fourth proportional to 663.92, 990.40 and 631.52 is: 942.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.92 : 990.40 = 631.52 : x
  2. Step 2: Convert to fraction form
    663.92/990.40 = 631.52/x
  3. Step 3: Cross multiply
    663.92x = 990.40 × 631.52
  4. Step 4: Simplify right side
    663.92x = 625,457.41
  5. Step 5: Solve for x
    x = 625,457.41/663.92
  6. Step 6: Final answer
    x = 942.07

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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.