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Finding the Fourth Proportional to 750.60, 1,125.60 and 311.55

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Solution

The fourth proportional to 750.60, 1,125.60 and 311.55 is: 467.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.60 : 1,125.60 = 311.55 : x
  2. Step 2: Convert to fraction form
    750.60/1,125.60 = 311.55/x
  3. Step 3: Cross multiply
    750.60x = 1,125.60 × 311.55
  4. Step 4: Simplify right side
    750.60x = 350,685.29
  5. Step 5: Solve for x
    x = 350,685.29/750.60
  6. Step 6: Final answer
    x = 467.21

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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.