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Finding the Fourth Proportional to 727.95, 1,003.87 and 561.90

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Solution

The fourth proportional to 727.95, 1,003.87 and 561.90 is: 774.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.95 : 1,003.87 = 561.90 : x
  2. Step 2: Convert to fraction form
    727.95/1,003.87 = 561.90/x
  3. Step 3: Cross multiply
    727.95x = 1,003.87 × 561.90
  4. Step 4: Simplify right side
    727.95x = 564,074.55
  5. Step 5: Solve for x
    x = 564,074.55/727.95
  6. Step 6: Final answer
    x = 774.88

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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.