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Finding the Fourth Proportional to 679.92, 938.70 and 470

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Solution

The fourth proportional to 679.92, 938.70 and 470 is: 648.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.92 : 938.70 = 470 : x
  2. Step 2: Convert to fraction form
    679.92/938.70 = 470/x
  3. Step 3: Cross multiply
    679.92x = 938.70 × 470
  4. Step 4: Simplify right side
    679.92x = 441,189
  5. Step 5: Solve for x
    x = 441,189/679.92
  6. Step 6: Final answer
    x = 648.88

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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.