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Finding the Fourth Proportional to 91,015.74, 135,811.55 and 81,559.46

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Solution

The fourth proportional to 91,015.74, 135,811.55 and 81,559.46 is: 121,701.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,015.74 : 135,811.55 = 81,559.46 : x
  2. Step 2: Convert to fraction form
    91,015.74/135,811.55 = 81,559.46/x
  3. Step 3: Cross multiply
    91,015.74x = 135,811.55 × 81,559.46
  4. Step 4: Simplify right side
    91,015.74x = 11,076,715,592.91
  5. Step 5: Solve for x
    x = 11,076,715,592.91/91,015.74
  6. Step 6: Final answer
    x = 121,701.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.