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Finding the Fourth Proportional to 85,405.70, 128,108.55 and 66,743.30

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Solution

The fourth proportional to 85,405.70, 128,108.55 and 66,743.30 is: 100,114.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.70 : 128,108.55 = 66,743.30 : x
  2. Step 2: Convert to fraction form
    85,405.70/128,108.55 = 66,743.30/x
  3. Step 3: Cross multiply
    85,405.70x = 128,108.55 × 66,743.30
  4. Step 4: Simplify right side
    85,405.70x = 8,550,387,385.22
  5. Step 5: Solve for x
    x = 8,550,387,385.22/85,405.70
  6. Step 6: Final answer
    x = 100,114.95

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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.