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Finding the Fourth Proportional to 680.48, 938.28 and 470.80

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Solution

The fourth proportional to 680.48, 938.28 and 470.80 is: 649.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.48 : 938.28 = 470.80 : x
  2. Step 2: Convert to fraction form
    680.48/938.28 = 470.80/x
  3. Step 3: Cross multiply
    680.48x = 938.28 × 470.80
  4. Step 4: Simplify right side
    680.48x = 441,742.22
  5. Step 5: Solve for x
    x = 441,742.22/680.48
  6. Step 6: Final answer
    x = 649.16

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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.