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Finding the Fourth Proportional to 81,321.66, 121,900.68 and 39,140.10

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Solution

The fourth proportional to 81,321.66, 121,900.68 and 39,140.10 is: 58,670.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.66 : 121,900.68 = 39,140.10 : x
  2. Step 2: Convert to fraction form
    81,321.66/121,900.68 = 39,140.10/x
  3. Step 3: Cross multiply
    81,321.66x = 121,900.68 × 39,140.10
  4. Step 4: Simplify right side
    81,321.66x = 4,771,204,805.27
  5. Step 5: Solve for x
    x = 4,771,204,805.27/81,321.66
  6. Step 6: Final answer
    x = 58,670.77

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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.