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Finding the Fourth Proportional to 218,903.18, 328,373.40 and 69,103.40

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Solution

The fourth proportional to 218,903.18, 328,373.40 and 69,103.40 is: 103,660.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,903.18 : 328,373.40 = 69,103.40 : x
  2. Step 2: Convert to fraction form
    218,903.18/328,373.40 = 69,103.40/x
  3. Step 3: Cross multiply
    218,903.18x = 328,373.40 × 69,103.40
  4. Step 4: Simplify right side
    218,903.18x = 22,691,718,409.56
  5. Step 5: Solve for x
    x = 22,691,718,409.56/218,903.18
  6. Step 6: Final answer
    x = 103,660.98

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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.