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Finding the Fourth Proportional to 85,535.40, 128,108.70 and 54,042.60

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Solution

The fourth proportional to 85,535.40, 128,108.70 and 54,042.60 is: 80,941.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,535.40 : 128,108.70 = 54,042.60 : x
  2. Step 2: Convert to fraction form
    85,535.40/128,108.70 = 54,042.60/x
  3. Step 3: Cross multiply
    85,535.40x = 128,108.70 × 54,042.60
  4. Step 4: Simplify right side
    85,535.40x = 6,923,327,230.62
  5. Step 5: Solve for x
    x = 6,923,327,230.62/85,535.40
  6. Step 6: Final answer
    x = 80,941.08

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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.