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Finding the Fourth Proportional to 702.15, 1,053.26 and 215.21

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Solution

The fourth proportional to 702.15, 1,053.26 and 215.21 is: 322.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.15 : 1,053.26 = 215.21 : x
  2. Step 2: Convert to fraction form
    702.15/1,053.26 = 215.21/x
  3. Step 3: Cross multiply
    702.15x = 1,053.26 × 215.21
  4. Step 4: Simplify right side
    702.15x = 226,672.08
  5. Step 5: Solve for x
    x = 226,672.08/702.15
  6. Step 6: Final answer
    x = 322.83

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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.