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Finding the Fourth Proportional to 85,687.80, 128,568.15 and 41,291.70

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Solution

The fourth proportional to 85,687.80, 128,568.15 and 41,291.70 is: 61,955.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.80 : 128,568.15 = 41,291.70 : x
  2. Step 2: Convert to fraction form
    85,687.80/128,568.15 = 41,291.70/x
  3. Step 3: Cross multiply
    85,687.80x = 128,568.15 × 41,291.70
  4. Step 4: Simplify right side
    85,687.80x = 5,308,797,479.36
  5. Step 5: Solve for x
    x = 5,308,797,479.36/85,687.80
  6. Step 6: Final answer
    x = 61,955.11

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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.