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Finding the Fourth Proportional to 752.32, 1,128.80 and 478.72

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Solution

The fourth proportional to 752.32, 1,128.80 and 478.72 is: 718.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.32 : 1,128.80 = 478.72 : x
  2. Step 2: Convert to fraction form
    752.32/1,128.80 = 478.72/x
  3. Step 3: Cross multiply
    752.32x = 1,128.80 × 478.72
  4. Step 4: Simplify right side
    752.32x = 540,379.14
  5. Step 5: Solve for x
    x = 540,379.14/752.32
  6. Step 6: Final answer
    x = 718.28

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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.