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Finding the Fourth Proportional to 925, 1,387.50 and 317

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Solution

The fourth proportional to 925, 1,387.50 and 317 is: 475.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    925 : 1,387.50 = 317 : x
  2. Step 2: Convert to fraction form
    925/1,387.50 = 317/x
  3. Step 3: Cross multiply
    925x = 1,387.50 × 317
  4. Step 4: Simplify right side
    925x = 439,837.50
  5. Step 5: Solve for x
    x = 439,837.50/925
  6. Step 6: Final answer
    x = 475.50

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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.