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Finding the Fourth Proportional to 813.39, 1,121.04 and 707.28

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Solution

The fourth proportional to 813.39, 1,121.04 and 707.28 is: 974.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.39 : 1,121.04 = 707.28 : x
  2. Step 2: Convert to fraction form
    813.39/1,121.04 = 707.28/x
  3. Step 3: Cross multiply
    813.39x = 1,121.04 × 707.28
  4. Step 4: Simplify right side
    813.39x = 792,889.17
  5. Step 5: Solve for x
    x = 792,889.17/813.39
  6. Step 6: Final answer
    x = 974.80

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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.