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Finding the Fourth Proportional to 925.12, 1,388.32 and 412.16

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Solution

The fourth proportional to 925.12, 1,388.32 and 412.16 is: 618.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.12 : 1,388.32 = 412.16 : x
  2. Step 2: Convert to fraction form
    925.12/1,388.32 = 412.16/x
  3. Step 3: Cross multiply
    925.12x = 1,388.32 × 412.16
  4. Step 4: Simplify right side
    925.12x = 572,209.97
  5. Step 5: Solve for x
    x = 572,209.97/925.12
  6. Step 6: Final answer
    x = 618.53

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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.