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Finding the Fourth Proportional to 85,507.40, 128,414.70 and 82,742.60

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Solution

The fourth proportional to 85,507.40, 128,414.70 and 82,742.60 is: 124,262.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,507.40 : 128,414.70 = 82,742.60 : x
  2. Step 2: Convert to fraction form
    85,507.40/128,414.70 = 82,742.60/x
  3. Step 3: Cross multiply
    85,507.40x = 128,414.70 × 82,742.60
  4. Step 4: Simplify right side
    85,507.40x = 10,625,366,156.22
  5. Step 5: Solve for x
    x = 10,625,366,156.22/85,507.40
  6. Step 6: Final answer
    x = 124,262.53

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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.