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Finding the Fourth Proportional to 752.05, 1,127.80 and 386.79

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Solution

The fourth proportional to 752.05, 1,127.80 and 386.79 is: 580.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.05 : 1,127.80 = 386.79 : x
  2. Step 2: Convert to fraction form
    752.05/1,127.80 = 386.79/x
  3. Step 3: Cross multiply
    752.05x = 1,127.80 × 386.79
  4. Step 4: Simplify right side
    752.05x = 436,221.76
  5. Step 5: Solve for x
    x = 436,221.76/752.05
  6. Step 6: Final answer
    x = 580.04

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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.