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Finding the Fourth Proportional to 1,291.68, 1,782.51 and 702.22

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Solution

The fourth proportional to 1,291.68, 1,782.51 and 702.22 is: 969.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.68 : 1,782.51 = 702.22 : x
  2. Step 2: Convert to fraction form
    1,291.68/1,782.51 = 702.22/x
  3. Step 3: Cross multiply
    1,291.68x = 1,782.51 × 702.22
  4. Step 4: Simplify right side
    1,291.68x = 1,251,714.17
  5. Step 5: Solve for x
    x = 1,251,714.17/1,291.68
  6. Step 6: Final answer
    x = 969.06

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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.