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Finding the Fourth Proportional to 81,988.72, 113,147.92 and 45,690.20

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Solution

The fourth proportional to 81,988.72, 113,147.92 and 45,690.20 is: 63,054.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,988.72 : 113,147.92 = 45,690.20 : x
  2. Step 2: Convert to fraction form
    81,988.72/113,147.92 = 45,690.20/x
  3. Step 3: Cross multiply
    81,988.72x = 113,147.92 × 45,690.20
  4. Step 4: Simplify right side
    81,988.72x = 5,169,751,094.38
  5. Step 5: Solve for x
    x = 5,169,751,094.38/81,988.72
  6. Step 6: Final answer
    x = 63,054.42

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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.