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Finding the Fourth Proportional to 218,791.98, 328,056.60 and 85,513.41

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Solution

The fourth proportional to 218,791.98, 328,056.60 and 85,513.41 is: 128,218.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,791.98 : 328,056.60 = 85,513.41 : x
  2. Step 2: Convert to fraction form
    218,791.98/328,056.60 = 85,513.41/x
  3. Step 3: Cross multiply
    218,791.98x = 328,056.60 × 85,513.41
  4. Step 4: Simplify right side
    218,791.98x = 28,053,238,539.01
  5. Step 5: Solve for x
    x = 28,053,238,539.01/218,791.98
  6. Step 6: Final answer
    x = 128,218.77

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1.5x scale

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.