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Finding the Fourth Proportional to 85,795.20, 128,433.60 and 75,427.20

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Solution

The fourth proportional to 85,795.20, 128,433.60 and 75,427.20 is: 112,912.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,795.20 : 128,433.60 = 75,427.20 : x
  2. Step 2: Convert to fraction form
    85,795.20/128,433.60 = 75,427.20/x
  3. Step 3: Cross multiply
    85,795.20x = 128,433.60 × 75,427.20
  4. Step 4: Simplify right side
    85,795.20x = 9,687,386,833.92
  5. Step 5: Solve for x
    x = 9,687,386,833.92/85,795.20
  6. Step 6: Final answer
    x = 112,912.92

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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.