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Finding the Fourth Proportional to 85,105.40, 127,658.10 and 79,856.60

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Solution

The fourth proportional to 85,105.40, 127,658.10 and 79,856.60 is: 119,784.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,105.40 : 127,658.10 = 79,856.60 : x
  2. Step 2: Convert to fraction form
    85,105.40/127,658.10 = 79,856.60/x
  3. Step 3: Cross multiply
    85,105.40x = 127,658.10 × 79,856.60
  4. Step 4: Simplify right side
    85,105.40x = 10,194,341,828.46
  5. Step 5: Solve for x
    x = 10,194,341,828.46/85,105.40
  6. Step 6: Final answer
    x = 119,784.90

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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.