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Finding the Fourth Proportional to 925.18, 1,387.31 and 514.60

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Solution

The fourth proportional to 925.18, 1,387.31 and 514.60 is: 771.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.18 : 1,387.31 = 514.60 : x
  2. Step 2: Convert to fraction form
    925.18/1,387.31 = 514.60/x
  3. Step 3: Cross multiply
    925.18x = 1,387.31 × 514.60
  4. Step 4: Simplify right side
    925.18x = 713,907.15
  5. Step 5: Solve for x
    x = 713,907.15/925.18
  6. Step 6: Final answer
    x = 771.64

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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.