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Finding the Fourth Proportional to 727.11, 1,002.72 and 478.32

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Solution

The fourth proportional to 727.11, 1,002.72 and 478.32 is: 659.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.11 : 1,002.72 = 478.32 : x
  2. Step 2: Convert to fraction form
    727.11/1,002.72 = 478.32/x
  3. Step 3: Cross multiply
    727.11x = 1,002.72 × 478.32
  4. Step 4: Simplify right side
    727.11x = 479,621.03
  5. Step 5: Solve for x
    x = 479,621.03/727.11
  6. Step 6: Final answer
    x = 659.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.