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Finding the Fourth Proportional to 702.47, 1,053.90 and 291.80

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Solution

The fourth proportional to 702.47, 1,053.90 and 291.80 is: 437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.47 : 1,053.90 = 291.80 : x
  2. Step 2: Convert to fraction form
    702.47/1,053.90 = 291.80/x
  3. Step 3: Cross multiply
    702.47x = 1,053.90 × 291.80
  4. Step 4: Simplify right side
    702.47x = 307,522.75
  5. Step 5: Solve for x
    x = 307,522.75/702.47
  6. Step 6: Final answer
    x = 437.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.