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Finding the Fourth Proportional to 691,740, 954,601.20 and 389,934

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Solution

The fourth proportional to 691,740, 954,601.20 and 389,934 is: 538,108.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,740 : 954,601.20 = 389,934 : x
  2. Step 2: Convert to fraction form
    691,740/954,601.20 = 389,934/x
  3. Step 3: Cross multiply
    691,740x = 954,601.20 × 389,934
  4. Step 4: Simplify right side
    691,740x = 372,231,464,320.80
  5. Step 5: Solve for x
    x = 372,231,464,320.80/691,740
  6. Step 6: Final answer
    x = 538,108.92

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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.