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Finding the Fourth Proportional to 747.21, 1,119.60 and 422.40

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Solution

The fourth proportional to 747.21, 1,119.60 and 422.40 is: 632.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.21 : 1,119.60 = 422.40 : x
  2. Step 2: Convert to fraction form
    747.21/1,119.60 = 422.40/x
  3. Step 3: Cross multiply
    747.21x = 1,119.60 × 422.40
  4. Step 4: Simplify right side
    747.21x = 472,919.04
  5. Step 5: Solve for x
    x = 472,919.04/747.21
  6. Step 6: Final answer
    x = 632.91

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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.