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Finding the Fourth Proportional to 1,224.08, 1,689.48 and 781.90

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Solution

The fourth proportional to 1,224.08, 1,689.48 and 781.90 is: 1,079.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.08 : 1,689.48 = 781.90 : x
  2. Step 2: Convert to fraction form
    1,224.08/1,689.48 = 781.90/x
  3. Step 3: Cross multiply
    1,224.08x = 1,689.48 × 781.90
  4. Step 4: Simplify right side
    1,224.08x = 1,321,004.41
  5. Step 5: Solve for x
    x = 1,321,004.41/1,224.08
  6. Step 6: Final answer
    x = 1,079.18

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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.