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Finding the Fourth Proportional to 81,472.20, 122,208.30 and 53,478.60

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Solution

The fourth proportional to 81,472.20, 122,208.30 and 53,478.60 is: 80,217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,472.20 : 122,208.30 = 53,478.60 : x
  2. Step 2: Convert to fraction form
    81,472.20/122,208.30 = 53,478.60/x
  3. Step 3: Cross multiply
    81,472.20x = 122,208.30 × 53,478.60
  4. Step 4: Simplify right side
    81,472.20x = 6,535,528,792.38
  5. Step 5: Solve for x
    x = 6,535,528,792.38/81,472.20
  6. Step 6: Final answer
    x = 80,217.90

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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.