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Finding the Fourth Proportional to 470.80, 649.65 and 339.85

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Solution

The fourth proportional to 470.80, 649.65 and 339.85 is: 468.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.80 : 649.65 = 339.85 : x
  2. Step 2: Convert to fraction form
    470.80/649.65 = 339.85/x
  3. Step 3: Cross multiply
    470.80x = 649.65 × 339.85
  4. Step 4: Simplify right side
    470.80x = 220,783.55
  5. Step 5: Solve for x
    x = 220,783.55/470.80
  6. Step 6: Final answer
    x = 468.95

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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.