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Finding the Fourth Proportional to 218,921.94, 328,382.90 and 100,692.72

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Solution

The fourth proportional to 218,921.94, 328,382.90 and 100,692.72 is: 151,039.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,921.94 : 328,382.90 = 100,692.72 : x
  2. Step 2: Convert to fraction form
    218,921.94/328,382.90 = 100,692.72/x
  3. Step 3: Cross multiply
    218,921.94x = 328,382.90 × 100,692.72
  4. Step 4: Simplify right side
    218,921.94x = 33,065,767,402.49
  5. Step 5: Solve for x
    x = 33,065,767,402.49/218,921.94
  6. Step 6: Final answer
    x = 151,039.08

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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.