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Finding the Fourth Proportional to 81,231.70, 121,628.85 and 81,231.70

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Solution

The fourth proportional to 81,231.70, 121,628.85 and 81,231.70 is: 121,628.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,231.70 : 121,628.85 = 81,231.70 : x
  2. Step 2: Convert to fraction form
    81,231.70/121,628.85 = 81,231.70/x
  3. Step 3: Cross multiply
    81,231.70x = 121,628.85 × 81,231.70
  4. Step 4: Simplify right side
    81,231.70x = 9,880,118,254.55
  5. Step 5: Solve for x
    x = 9,880,118,254.55/81,231.70
  6. Step 6: Final answer
    x = 121,628.85

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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.