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Finding the Fourth Proportional to 613.35, 918.42 and 515.63

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Solution

The fourth proportional to 613.35, 918.42 and 515.63 is: 772.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.35 : 918.42 = 515.63 : x
  2. Step 2: Convert to fraction form
    613.35/918.42 = 515.63/x
  3. Step 3: Cross multiply
    613.35x = 918.42 × 515.63
  4. Step 4: Simplify right side
    613.35x = 473,560.31
  5. Step 5: Solve for x
    x = 473,560.31/613.35
  6. Step 6: Final answer
    x = 772.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.