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Finding the Fourth Proportional to 680, 938.40 and 369.50

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Solution

The fourth proportional to 680, 938.40 and 369.50 is: 509.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    680 : 938.40 = 369.50 : x
  2. Step 2: Convert to fraction form
    680/938.40 = 369.50/x
  3. Step 3: Cross multiply
    680x = 938.40 × 369.50
  4. Step 4: Simplify right side
    680x = 346,738.80
  5. Step 5: Solve for x
    x = 346,738.80/680
  6. Step 6: Final answer
    x = 509.91

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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.