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Finding the Fourth Proportional to 91,111.80, 136,667.70 and 81,262.20

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Solution

The fourth proportional to 91,111.80, 136,667.70 and 81,262.20 is: 121,893.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,111.80 : 136,667.70 = 81,262.20 : x
  2. Step 2: Convert to fraction form
    91,111.80/136,667.70 = 81,262.20/x
  3. Step 3: Cross multiply
    91,111.80x = 136,667.70 × 81,262.20
  4. Step 4: Simplify right side
    91,111.80x = 11,105,917,970.94
  5. Step 5: Solve for x
    x = 11,105,917,970.94/91,111.80
  6. Step 6: Final answer
    x = 121,893.30

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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.