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Finding the Fourth Proportional to 92,486.84, 138,061.08 and 81,276.80

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Solution

The fourth proportional to 92,486.84, 138,061.08 and 81,276.80 is: 121,327.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,486.84 : 138,061.08 = 81,276.80 : x
  2. Step 2: Convert to fraction form
    92,486.84/138,061.08 = 81,276.80/x
  3. Step 3: Cross multiply
    92,486.84x = 138,061.08 × 81,276.80
  4. Step 4: Simplify right side
    92,486.84x = 11,221,162,786.94
  5. Step 5: Solve for x
    x = 11,221,162,786.94/92,486.84
  6. Step 6: Final answer
    x = 121,327.13

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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.