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Finding the Fourth Proportional to 749.95, 1,125.16 and 311.41

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Solution

The fourth proportional to 749.95, 1,125.16 and 311.41 is: 467.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.95 : 1,125.16 = 311.41 : x
  2. Step 2: Convert to fraction form
    749.95/1,125.16 = 311.41/x
  3. Step 3: Cross multiply
    749.95x = 1,125.16 × 311.41
  4. Step 4: Simplify right side
    749.95x = 350,388.46
  5. Step 5: Solve for x
    x = 350,388.46/749.95
  6. Step 6: Final answer
    x = 467.22

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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.