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Finding the Fourth Proportional to 702.09, 1,053.16 and 215.15

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Solution

The fourth proportional to 702.09, 1,053.16 and 215.15 is: 322.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.09 : 1,053.16 = 215.15 : x
  2. Step 2: Convert to fraction form
    702.09/1,053.16 = 215.15/x
  3. Step 3: Cross multiply
    702.09x = 1,053.16 × 215.15
  4. Step 4: Simplify right side
    702.09x = 226,581.57
  5. Step 5: Solve for x
    x = 226,581.57/702.09
  6. Step 6: Final answer
    x = 322.72

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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.