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Finding the Fourth Proportional to 218,954.61, 328,286.12 and 78,695.01

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Solution

The fourth proportional to 218,954.61, 328,286.12 and 78,695.01 is: 117,990.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,954.61 : 328,286.12 = 78,695.01 : x
  2. Step 2: Convert to fraction form
    218,954.61/328,286.12 = 78,695.01/x
  3. Step 3: Cross multiply
    218,954.61x = 328,286.12 × 78,695.01
  4. Step 4: Simplify right side
    218,954.61x = 25,834,479,102.79
  5. Step 5: Solve for x
    x = 25,834,479,102.79/218,954.61
  6. Step 6: Final answer
    x = 117,990.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.