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Finding the Fourth Proportional to 218,900.68, 328,369.65 and 69,100.90

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Solution

The fourth proportional to 218,900.68, 328,369.65 and 69,100.90 is: 103,657.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,900.68 : 328,369.65 = 69,100.90 : x
  2. Step 2: Convert to fraction form
    218,900.68/328,369.65 = 69,100.90/x
  3. Step 3: Cross multiply
    218,900.68x = 328,369.65 × 69,100.90
  4. Step 4: Simplify right side
    218,900.68x = 22,690,638,347.69
  5. Step 5: Solve for x
    x = 22,690,638,347.69/218,900.68
  6. Step 6: Final answer
    x = 103,657.23

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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.