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Finding the Fourth Proportional to 925.12, 1,386.94 and 631.88

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Solution

The fourth proportional to 925.12, 1,386.94 and 631.88 is: 947.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.12 : 1,386.94 = 631.88 : x
  2. Step 2: Convert to fraction form
    925.12/1,386.94 = 631.88/x
  3. Step 3: Cross multiply
    925.12x = 1,386.94 × 631.88
  4. Step 4: Simplify right side
    925.12x = 876,379.65
  5. Step 5: Solve for x
    x = 876,379.65/925.12
  6. Step 6: Final answer
    x = 947.31

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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.