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Finding the Fourth Proportional to 961.16, 1,442.70 and 747.08

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Solution

The fourth proportional to 961.16, 1,442.70 and 747.08 is: 1,121.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.16 : 1,442.70 = 747.08 : x
  2. Step 2: Convert to fraction form
    961.16/1,442.70 = 747.08/x
  3. Step 3: Cross multiply
    961.16x = 1,442.70 × 747.08
  4. Step 4: Simplify right side
    961.16x = 1,077,812.32
  5. Step 5: Solve for x
    x = 1,077,812.32/961.16
  6. Step 6: Final answer
    x = 1,121.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.