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Finding the Fourth Proportional to 218,534.10, 327,801.15 and 85,418.70

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Solution

The fourth proportional to 218,534.10, 327,801.15 and 85,418.70 is: 128,128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,534.10 : 327,801.15 = 85,418.70 : x
  2. Step 2: Convert to fraction form
    218,534.10/327,801.15 = 85,418.70/x
  3. Step 3: Cross multiply
    218,534.10x = 327,801.15 × 85,418.70
  4. Step 4: Simplify right side
    218,534.10x = 28,000,348,091.51
  5. Step 5: Solve for x
    x = 28,000,348,091.51/218,534.10
  6. Step 6: Final answer
    x = 128,128.05

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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.