Home / 81,139.14-121,543.47-66,199.50

Finding the Fourth Proportional to 81,139.14, 121,543.47 and 66,199.50

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Solution

The fourth proportional to 81,139.14, 121,543.47 and 66,199.50 is: 99,164.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,139.14 : 121,543.47 = 66,199.50 : x
  2. Step 2: Convert to fraction form
    81,139.14/121,543.47 = 66,199.50/x
  3. Step 3: Cross multiply
    81,139.14x = 121,543.47 × 66,199.50
  4. Step 4: Simplify right side
    81,139.14x = 8,046,116,942.27
  5. Step 5: Solve for x
    x = 8,046,116,942.27/81,139.14
  6. Step 6: Final answer
    x = 99,164.43

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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.