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Finding the Fourth Proportional to 702.18, 1,053.20 and 215.24

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Solution

The fourth proportional to 702.18, 1,053.20 and 215.24 is: 322.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.18 : 1,053.20 = 215.24 : x
  2. Step 2: Convert to fraction form
    702.18/1,053.20 = 215.24/x
  3. Step 3: Cross multiply
    702.18x = 1,053.20 × 215.24
  4. Step 4: Simplify right side
    702.18x = 226,690.77
  5. Step 5: Solve for x
    x = 226,690.77/702.18
  6. Step 6: Final answer
    x = 322.84

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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.