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Finding the Fourth Proportional to 115,720.68, 159,687.01 and 64,724.57

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Solution

The fourth proportional to 115,720.68, 159,687.01 and 64,724.57 is: 89,315.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,720.68 : 159,687.01 = 64,724.57 : x
  2. Step 2: Convert to fraction form
    115,720.68/159,687.01 = 64,724.57/x
  3. Step 3: Cross multiply
    115,720.68x = 159,687.01 × 64,724.57
  4. Step 4: Simplify right side
    115,720.68x = 10,335,673,056.84
  5. Step 5: Solve for x
    x = 10,335,673,056.84/115,720.68
  6. Step 6: Final answer
    x = 89,315.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.