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Finding the Fourth Proportional to 218,709.60, 328,064.40 and 125,149.20

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Solution

The fourth proportional to 218,709.60, 328,064.40 and 125,149.20 is: 187,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,709.60 : 328,064.40 = 125,149.20 : x
  2. Step 2: Convert to fraction form
    218,709.60/328,064.40 = 125,149.20/x
  3. Step 3: Cross multiply
    218,709.60x = 328,064.40 × 125,149.20
  4. Step 4: Simplify right side
    218,709.60x = 41,056,997,208.48
  5. Step 5: Solve for x
    x = 41,056,997,208.48/218,709.60
  6. Step 6: Final answer
    x = 187,723.80

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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.