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Finding the Fourth Proportional to 1,161.59, 1,603.02 and 689.72

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Solution

The fourth proportional to 1,161.59, 1,603.02 and 689.72 is: 951.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.59 : 1,603.02 = 689.72 : x
  2. Step 2: Convert to fraction form
    1,161.59/1,603.02 = 689.72/x
  3. Step 3: Cross multiply
    1,161.59x = 1,603.02 × 689.72
  4. Step 4: Simplify right side
    1,161.59x = 1,105,626.94
  5. Step 5: Solve for x
    x = 1,105,626.94/1,161.59
  6. Step 6: Final answer
    x = 951.83

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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.