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Finding the Fourth Proportional to 752.75, 1,128.75 and 313.87

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Solution

The fourth proportional to 752.75, 1,128.75 and 313.87 is: 470.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.75 : 1,128.75 = 313.87 : x
  2. Step 2: Convert to fraction form
    752.75/1,128.75 = 313.87/x
  3. Step 3: Cross multiply
    752.75x = 1,128.75 × 313.87
  4. Step 4: Simplify right side
    752.75x = 354,280.51
  5. Step 5: Solve for x
    x = 354,280.51/752.75
  6. Step 6: Final answer
    x = 470.65

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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.