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Finding the Fourth Proportional to 752.37, 1,128.80 and 313.65

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Solution

The fourth proportional to 752.37, 1,128.80 and 313.65 is: 470.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.37 : 1,128.80 = 313.65 : x
  2. Step 2: Convert to fraction form
    752.37/1,128.80 = 313.65/x
  3. Step 3: Cross multiply
    752.37x = 1,128.80 × 313.65
  4. Step 4: Simplify right side
    752.37x = 354,046.55
  5. Step 5: Solve for x
    x = 354,046.55/752.37
  6. Step 6: Final answer
    x = 470.58

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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.