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Finding the Fourth Proportional to 801.30, 1,105.20 and 707.88

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Solution

The fourth proportional to 801.30, 1,105.20 and 707.88 is: 976.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.30 : 1,105.20 = 707.88 : x
  2. Step 2: Convert to fraction form
    801.30/1,105.20 = 707.88/x
  3. Step 3: Cross multiply
    801.30x = 1,105.20 × 707.88
  4. Step 4: Simplify right side
    801.30x = 782,348.98
  5. Step 5: Solve for x
    x = 782,348.98/801.30
  6. Step 6: Final answer
    x = 976.35

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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.