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Finding the Fourth Proportional to 747.08, 1,121.16 and 423.08

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Solution

The fourth proportional to 747.08, 1,121.16 and 423.08 is: 634.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.08 : 1,121.16 = 423.08 : x
  2. Step 2: Convert to fraction form
    747.08/1,121.16 = 423.08/x
  3. Step 3: Cross multiply
    747.08x = 1,121.16 × 423.08
  4. Step 4: Simplify right side
    747.08x = 474,340.37
  5. Step 5: Solve for x
    x = 474,340.37/747.08
  6. Step 6: Final answer
    x = 634.93

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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.