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Finding the Fourth Proportional to 752.48, 1,127.70 and 386.50

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Solution

The fourth proportional to 752.48, 1,127.70 and 386.50 is: 579.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.48 : 1,127.70 = 386.50 : x
  2. Step 2: Convert to fraction form
    752.48/1,127.70 = 386.50/x
  3. Step 3: Cross multiply
    752.48x = 1,127.70 × 386.50
  4. Step 4: Simplify right side
    752.48x = 435,856.05
  5. Step 5: Solve for x
    x = 435,856.05/752.48
  6. Step 6: Final answer
    x = 579.23

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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.