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Finding the Fourth Proportional to 85,680.40, 128,454.70 and 43,525.84

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Solution

The fourth proportional to 85,680.40, 128,454.70 and 43,525.84 is: 65,255.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,680.40 : 128,454.70 = 43,525.84 : x
  2. Step 2: Convert to fraction form
    85,680.40/128,454.70 = 43,525.84/x
  3. Step 3: Cross multiply
    85,680.40x = 128,454.70 × 43,525.84
  4. Step 4: Simplify right side
    85,680.40x = 5,591,098,719.45
  5. Step 5: Solve for x
    x = 5,591,098,719.45/85,680.40
  6. Step 6: Final answer
    x = 65,255.28

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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.