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Finding the Fourth Proportional to 346.80, 517.70 and 321.47

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Solution

The fourth proportional to 346.80, 517.70 and 321.47 is: 479.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.80 : 517.70 = 321.47 : x
  2. Step 2: Convert to fraction form
    346.80/517.70 = 321.47/x
  3. Step 3: Cross multiply
    346.80x = 517.70 × 321.47
  4. Step 4: Simplify right side
    346.80x = 166,421.63
  5. Step 5: Solve for x
    x = 166,421.63/346.80
  6. Step 6: Final answer
    x = 479.88

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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.