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Finding the Fourth Proportional to 91,688.84, 137,546.09 and 86,646.59

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Solution

The fourth proportional to 91,688.84, 137,546.09 and 86,646.59 is: 129,982.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,688.84 : 137,546.09 = 86,646.59 : x
  2. Step 2: Convert to fraction form
    91,688.84/137,546.09 = 86,646.59/x
  3. Step 3: Cross multiply
    91,688.84x = 137,546.09 × 86,646.59
  4. Step 4: Simplify right side
    91,688.84x = 11,917,898,877.40
  5. Step 5: Solve for x
    x = 11,917,898,877.40/91,688.84
  6. Step 6: Final answer
    x = 129,982.01

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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.