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Finding the Fourth Proportional to 727.16, 1,002.79 and 491.15

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Solution

The fourth proportional to 727.16, 1,002.79 and 491.15 is: 677.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.16 : 1,002.79 = 491.15 : x
  2. Step 2: Convert to fraction form
    727.16/1,002.79 = 491.15/x
  3. Step 3: Cross multiply
    727.16x = 1,002.79 × 491.15
  4. Step 4: Simplify right side
    727.16x = 492,520.31
  5. Step 5: Solve for x
    x = 492,520.31/727.16
  6. Step 6: Final answer
    x = 677.32

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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.