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Finding the Fourth Proportional to 390,766.53, 539,286.78 and 218,701.74

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Solution

The fourth proportional to 390,766.53, 539,286.78 and 218,701.74 is: 301,824.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,766.53 : 539,286.78 = 218,701.74 : x
  2. Step 2: Convert to fraction form
    390,766.53/539,286.78 = 218,701.74/x
  3. Step 3: Cross multiply
    390,766.53x = 539,286.78 × 218,701.74
  4. Step 4: Simplify right side
    390,766.53x = 117,942,957,145.00
  5. Step 5: Solve for x
    x = 117,942,957,145.00/390,766.53
  6. Step 6: Final answer
    x = 301,824.61

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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.