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Finding the Fourth Proportional to 85,538.40, 128,113.20 and 54,045.60

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Solution

The fourth proportional to 85,538.40, 128,113.20 and 54,045.60 is: 80,945.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,538.40 : 128,113.20 = 54,045.60 : x
  2. Step 2: Convert to fraction form
    85,538.40/128,113.20 = 54,045.60/x
  3. Step 3: Cross multiply
    85,538.40x = 128,113.20 × 54,045.60
  4. Step 4: Simplify right side
    85,538.40x = 6,923,954,761.92
  5. Step 5: Solve for x
    x = 6,923,954,761.92/85,538.40
  6. Step 6: Final answer
    x = 80,945.57

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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.