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Finding the Fourth Proportional to 218,692.65, 328,138.93 and 98,781.66

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Solution

The fourth proportional to 218,692.65, 328,138.93 and 98,781.66 is: 148,217.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,692.65 : 328,138.93 = 98,781.66 : x
  2. Step 2: Convert to fraction form
    218,692.65/328,138.93 = 98,781.66/x
  3. Step 3: Cross multiply
    218,692.65x = 328,138.93 × 98,781.66
  4. Step 4: Simplify right side
    218,692.65x = 32,414,107,969.07
  5. Step 5: Solve for x
    x = 32,414,107,969.07/218,692.65
  6. Step 6: Final answer
    x = 148,217.64

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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.