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Finding the Fourth Proportional to 1,291.70, 1,782.56 and 702.24

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Solution

The fourth proportional to 1,291.70, 1,782.56 and 702.24 is: 969.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.70 : 1,782.56 = 702.24 : x
  2. Step 2: Convert to fraction form
    1,291.70/1,782.56 = 702.24/x
  3. Step 3: Cross multiply
    1,291.70x = 1,782.56 × 702.24
  4. Step 4: Simplify right side
    1,291.70x = 1,251,781.42
  5. Step 5: Solve for x
    x = 1,251,781.42/1,291.70
  6. Step 6: Final answer
    x = 969.09

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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.