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Finding the Fourth Proportional to 613.60, 921.84 and 505.60

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Solution

The fourth proportional to 613.60, 921.84 and 505.60 is: 759.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.60 : 921.84 = 505.60 : x
  2. Step 2: Convert to fraction form
    613.60/921.84 = 505.60/x
  3. Step 3: Cross multiply
    613.60x = 921.84 × 505.60
  4. Step 4: Simplify right side
    613.60x = 466,082.30
  5. Step 5: Solve for x
    x = 466,082.30/613.60
  6. Step 6: Final answer
    x = 759.59

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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.