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Finding the Fourth Proportional to 753.66, 1,128.92 and 478.39

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Solution

The fourth proportional to 753.66, 1,128.92 and 478.39 is: 716.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.66 : 1,128.92 = 478.39 : x
  2. Step 2: Convert to fraction form
    753.66/1,128.92 = 478.39/x
  3. Step 3: Cross multiply
    753.66x = 1,128.92 × 478.39
  4. Step 4: Simplify right side
    753.66x = 540,060.94
  5. Step 5: Solve for x
    x = 540,060.94/753.66
  6. Step 6: Final answer
    x = 716.58

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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.