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Finding the Fourth Proportional to 1,132.08, 1,561.19 and 689.82

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Solution

The fourth proportional to 1,132.08, 1,561.19 and 689.82 is: 951.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.08 : 1,561.19 = 689.82 : x
  2. Step 2: Convert to fraction form
    1,132.08/1,561.19 = 689.82/x
  3. Step 3: Cross multiply
    1,132.08x = 1,561.19 × 689.82
  4. Step 4: Simplify right side
    1,132.08x = 1,076,936.64
  5. Step 5: Solve for x
    x = 1,076,936.64/1,132.08
  6. Step 6: Final answer
    x = 951.29

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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.