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Finding the Fourth Proportional to 613.59, 913.05 and 611.55

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Solution

The fourth proportional to 613.59, 913.05 and 611.55 is: 910.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.59 : 913.05 = 611.55 : x
  2. Step 2: Convert to fraction form
    613.59/913.05 = 611.55/x
  3. Step 3: Cross multiply
    613.59x = 913.05 × 611.55
  4. Step 4: Simplify right side
    613.59x = 558,375.73
  5. Step 5: Solve for x
    x = 558,375.73/613.59
  6. Step 6: Final answer
    x = 910.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.