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Finding the Fourth Proportional to 478.03, 659.79 and 311.95

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Solution

The fourth proportional to 478.03, 659.79 and 311.95 is: 430.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.03 : 659.79 = 311.95 : x
  2. Step 2: Convert to fraction form
    478.03/659.79 = 311.95/x
  3. Step 3: Cross multiply
    478.03x = 659.79 × 311.95
  4. Step 4: Simplify right side
    478.03x = 205,821.49
  5. Step 5: Solve for x
    x = 205,821.49/478.03
  6. Step 6: Final answer
    x = 430.56

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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.