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Finding the Fourth Proportional to 747.90, 1,031.90 and 416.25

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Solution

The fourth proportional to 747.90, 1,031.90 and 416.25 is: 574.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.90 : 1,031.90 = 416.25 : x
  2. Step 2: Convert to fraction form
    747.90/1,031.90 = 416.25/x
  3. Step 3: Cross multiply
    747.90x = 1,031.90 × 416.25
  4. Step 4: Simplify right side
    747.90x = 429,529.42
  5. Step 5: Solve for x
    x = 429,529.42/747.90
  6. Step 6: Final answer
    x = 574.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.