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Finding the Fourth Proportional to 750.39, 1,125.72 and 256.85

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Solution

The fourth proportional to 750.39, 1,125.72 and 256.85 is: 385.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.39 : 1,125.72 = 256.85 : x
  2. Step 2: Convert to fraction form
    750.39/1,125.72 = 256.85/x
  3. Step 3: Cross multiply
    750.39x = 1,125.72 × 256.85
  4. Step 4: Simplify right side
    750.39x = 289,141.18
  5. Step 5: Solve for x
    x = 289,141.18/750.39
  6. Step 6: Final answer
    x = 385.32

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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.