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Finding the Fourth Proportional to 86,741.80, 130,112.70 and 81,039.40

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Solution

The fourth proportional to 86,741.80, 130,112.70 and 81,039.40 is: 121,559.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,741.80 : 130,112.70 = 81,039.40 : x
  2. Step 2: Convert to fraction form
    86,741.80/130,112.70 = 81,039.40/x
  3. Step 3: Cross multiply
    86,741.80x = 130,112.70 × 81,039.40
  4. Step 4: Simplify right side
    86,741.80x = 10,544,255,140.38
  5. Step 5: Solve for x
    x = 10,544,255,140.38/86,741.80
  6. Step 6: Final answer
    x = 121,559.10

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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.