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Finding the Fourth Proportional to 747.20, 1,119.90 and 382.07

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Solution

The fourth proportional to 747.20, 1,119.90 and 382.07 is: 572.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.20 : 1,119.90 = 382.07 : x
  2. Step 2: Convert to fraction form
    747.20/1,119.90 = 382.07/x
  3. Step 3: Cross multiply
    747.20x = 1,119.90 × 382.07
  4. Step 4: Simplify right side
    747.20x = 427,880.19
  5. Step 5: Solve for x
    x = 427,880.19/747.20
  6. Step 6: Final answer
    x = 572.64

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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.