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Finding the Fourth Proportional to 750.18, 1,125.18 and 317.28

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Solution

The fourth proportional to 750.18, 1,125.18 and 317.28 is: 475.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.18 : 1,125.18 = 317.28 : x
  2. Step 2: Convert to fraction form
    750.18/1,125.18 = 317.28/x
  3. Step 3: Cross multiply
    750.18x = 1,125.18 × 317.28
  4. Step 4: Simplify right side
    750.18x = 356,997.11
  5. Step 5: Solve for x
    x = 356,997.11/750.18
  6. Step 6: Final answer
    x = 475.88

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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.