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Finding the Fourth Proportional to 750.31, 1,125.45 and 339.22

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Solution

The fourth proportional to 750.31, 1,125.45 and 339.22 is: 508.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.31 : 1,125.45 = 339.22 : x
  2. Step 2: Convert to fraction form
    750.31/1,125.45 = 339.22/x
  3. Step 3: Cross multiply
    750.31x = 1,125.45 × 339.22
  4. Step 4: Simplify right side
    750.31x = 381,775.15
  5. Step 5: Solve for x
    x = 381,775.15/750.31
  6. Step 6: Final answer
    x = 508.82

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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.