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Finding the Fourth Proportional to 747.36, 1,119.36 and 422.40

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Solution

The fourth proportional to 747.36, 1,119.36 and 422.40 is: 632.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.36 : 1,119.36 = 422.40 : x
  2. Step 2: Convert to fraction form
    747.36/1,119.36 = 422.40/x
  3. Step 3: Cross multiply
    747.36x = 1,119.36 × 422.40
  4. Step 4: Simplify right side
    747.36x = 472,817.66
  5. Step 5: Solve for x
    x = 472,817.66/747.36
  6. Step 6: Final answer
    x = 632.65

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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.