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Finding the Fourth Proportional to 727, 1,003.46 and 491.28

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Solution

The fourth proportional to 727, 1,003.46 and 491.28 is: 678.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    727 : 1,003.46 = 491.28 : x
  2. Step 2: Convert to fraction form
    727/1,003.46 = 491.28/x
  3. Step 3: Cross multiply
    727x = 1,003.46 × 491.28
  4. Step 4: Simplify right side
    727x = 492,979.83
  5. Step 5: Solve for x
    x = 492,979.83/727
  6. Step 6: Final answer
    x = 678.10

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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.