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Finding the Fourth Proportional to 515.56, 769.60 and 478.44

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Solution

The fourth proportional to 515.56, 769.60 and 478.44 is: 714.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.56 : 769.60 = 478.44 : x
  2. Step 2: Convert to fraction form
    515.56/769.60 = 478.44/x
  3. Step 3: Cross multiply
    515.56x = 769.60 × 478.44
  4. Step 4: Simplify right side
    515.56x = 368,207.42
  5. Step 5: Solve for x
    x = 368,207.42/515.56
  6. Step 6: Final answer
    x = 714.19

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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.