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Finding the Fourth Proportional to 85,890.30, 128,835.45 and 43,899.90

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Solution

The fourth proportional to 85,890.30, 128,835.45 and 43,899.90 is: 65,849.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,890.30 : 128,835.45 = 43,899.90 : x
  2. Step 2: Convert to fraction form
    85,890.30/128,835.45 = 43,899.90/x
  3. Step 3: Cross multiply
    85,890.30x = 128,835.45 × 43,899.90
  4. Step 4: Simplify right side
    85,890.30x = 5,655,863,371.46
  5. Step 5: Solve for x
    x = 5,655,863,371.46/85,890.30
  6. Step 6: Final answer
    x = 65,849.85

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Similar ratio
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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.