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Finding the Fourth Proportional to 679.99, 938.71 and 556.98

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Solution

The fourth proportional to 679.99, 938.71 and 556.98 is: 768.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.99 : 938.71 = 556.98 : x
  2. Step 2: Convert to fraction form
    679.99/938.71 = 556.98/x
  3. Step 3: Cross multiply
    679.99x = 938.71 × 556.98
  4. Step 4: Simplify right side
    679.99x = 522,842.70
  5. Step 5: Solve for x
    x = 522,842.70/679.99
  6. Step 6: Final answer
    x = 768.90

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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.