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Finding the Fourth Proportional to 517.50, 714.96 and 478.08

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Solution

The fourth proportional to 517.50, 714.96 and 478.08 is: 660.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.50 : 714.96 = 478.08 : x
  2. Step 2: Convert to fraction form
    517.50/714.96 = 478.08/x
  3. Step 3: Cross multiply
    517.50x = 714.96 × 478.08
  4. Step 4: Simplify right side
    517.50x = 341,808.08
  5. Step 5: Solve for x
    x = 341,808.08/517.50
  6. Step 6: Final answer
    x = 660.50

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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.