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Finding the Fourth Proportional to 81,115.50, 111,939.12 and 45,305.52

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Solution

The fourth proportional to 81,115.50, 111,939.12 and 45,305.52 is: 62,521.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,115.50 : 111,939.12 = 45,305.52 : x
  2. Step 2: Convert to fraction form
    81,115.50/111,939.12 = 45,305.52/x
  3. Step 3: Cross multiply
    81,115.50x = 111,939.12 × 45,305.52
  4. Step 4: Simplify right side
    81,115.50x = 5,071,460,039.94
  5. Step 5: Solve for x
    x = 5,071,460,039.94/81,115.50
  6. Step 6: Final answer
    x = 62,521.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.