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Finding the Fourth Proportional to 517.90, 715.18 and 321.46

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Solution

The fourth proportional to 517.90, 715.18 and 321.46 is: 443.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.90 : 715.18 = 321.46 : x
  2. Step 2: Convert to fraction form
    517.90/715.18 = 321.46/x
  3. Step 3: Cross multiply
    517.90x = 715.18 × 321.46
  4. Step 4: Simplify right side
    517.90x = 229,901.76
  5. Step 5: Solve for x
    x = 229,901.76/517.90
  6. Step 6: Final answer
    x = 443.91

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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.