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Finding the Fourth Proportional to 702.39, 1,053.42 and 215.31

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Solution

The fourth proportional to 702.39, 1,053.42 and 215.31 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.39 : 1,053.42 = 215.31 : x
  2. Step 2: Convert to fraction form
    702.39/1,053.42 = 215.31/x
  3. Step 3: Cross multiply
    702.39x = 1,053.42 × 215.31
  4. Step 4: Simplify right side
    702.39x = 226,811.86
  5. Step 5: Solve for x
    x = 226,811.86/702.39
  6. Step 6: Final answer
    x = 322.91

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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.