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Finding the Fourth Proportional to 979.92, 1,352.16 and 631.08

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Solution

The fourth proportional to 979.92, 1,352.16 and 631.08 is: 870.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.92 : 1,352.16 = 631.08 : x
  2. Step 2: Convert to fraction form
    979.92/1,352.16 = 631.08/x
  3. Step 3: Cross multiply
    979.92x = 1,352.16 × 631.08
  4. Step 4: Simplify right side
    979.92x = 853,321.13
  5. Step 5: Solve for x
    x = 853,321.13/979.92
  6. Step 6: Final answer
    x = 870.81

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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.