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Finding the Fourth Proportional to 1,174.20, 1,620.54 and 702.24

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Solution

The fourth proportional to 1,174.20, 1,620.54 and 702.24 is: 969.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.20 : 1,620.54 = 702.24 : x
  2. Step 2: Convert to fraction form
    1,174.20/1,620.54 = 702.24/x
  3. Step 3: Cross multiply
    1,174.20x = 1,620.54 × 702.24
  4. Step 4: Simplify right side
    1,174.20x = 1,138,008.01
  5. Step 5: Solve for x
    x = 1,138,008.01/1,174.20
  6. Step 6: Final answer
    x = 969.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.