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Finding the Fourth Proportional to 679.80, 937.79 and 400.02

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Solution

The fourth proportional to 679.80, 937.79 and 400.02 is: 551.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.80 : 937.79 = 400.02 : x
  2. Step 2: Convert to fraction form
    679.80/937.79 = 400.02/x
  3. Step 3: Cross multiply
    679.80x = 937.79 × 400.02
  4. Step 4: Simplify right side
    679.80x = 375,130.74
  5. Step 5: Solve for x
    x = 375,130.74/679.80
  6. Step 6: Final answer
    x = 551.83

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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.