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Finding the Fourth Proportional to 747.24, 1,115.49 and 698.28

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Solution

The fourth proportional to 747.24, 1,115.49 and 698.28 is: 1,042.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.24 : 1,115.49 = 698.28 : x
  2. Step 2: Convert to fraction form
    747.24/1,115.49 = 698.28/x
  3. Step 3: Cross multiply
    747.24x = 1,115.49 × 698.28
  4. Step 4: Simplify right side
    747.24x = 778,924.36
  5. Step 5: Solve for x
    x = 778,924.36/747.24
  6. Step 6: Final answer
    x = 1,042.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.