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Finding the Fourth Proportional to 727.76, 1,005.45 and 618.38

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Solution

The fourth proportional to 727.76, 1,005.45 and 618.38 is: 854.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.76 : 1,005.45 = 618.38 : x
  2. Step 2: Convert to fraction form
    727.76/1,005.45 = 618.38/x
  3. Step 3: Cross multiply
    727.76x = 1,005.45 × 618.38
  4. Step 4: Simplify right side
    727.76x = 621,750.17
  5. Step 5: Solve for x
    x = 621,750.17/727.76
  6. Step 6: Final answer
    x = 854.33

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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.