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Finding the Fourth Proportional to 91,091.06, 135,731.02 and 81,153.98

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Solution

The fourth proportional to 91,091.06, 135,731.02 and 81,153.98 is: 120,924.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,091.06 : 135,731.02 = 81,153.98 : x
  2. Step 2: Convert to fraction form
    91,091.06/135,731.02 = 81,153.98/x
  3. Step 3: Cross multiply
    91,091.06x = 135,731.02 × 81,153.98
  4. Step 4: Simplify right side
    91,091.06x = 11,015,112,482.46
  5. Step 5: Solve for x
    x = 11,015,112,482.46/91,091.06
  6. Step 6: Final answer
    x = 120,924.19

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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.