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Finding the Fourth Proportional to 517.60, 713.52 and 423.20

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Solution

The fourth proportional to 517.60, 713.52 and 423.20 is: 583.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.60 : 713.52 = 423.20 : x
  2. Step 2: Convert to fraction form
    517.60/713.52 = 423.20/x
  3. Step 3: Cross multiply
    517.60x = 713.52 × 423.20
  4. Step 4: Simplify right side
    517.60x = 301,961.66
  5. Step 5: Solve for x
    x = 301,961.66/517.60
  6. Step 6: Final answer
    x = 583.39

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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.