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Finding the Fourth Proportional to 747.70, 1,120.20 and 631.60

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Solution

The fourth proportional to 747.70, 1,120.20 and 631.60 is: 946.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.70 : 1,120.20 = 631.60 : x
  2. Step 2: Convert to fraction form
    747.70/1,120.20 = 631.60/x
  3. Step 3: Cross multiply
    747.70x = 1,120.20 × 631.60
  4. Step 4: Simplify right side
    747.70x = 707,518.32
  5. Step 5: Solve for x
    x = 707,518.32/747.70
  6. Step 6: Final answer
    x = 946.26

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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.