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Finding the Fourth Proportional to 68,587.20, 103,053.60 and 43,639.20

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Solution

The fourth proportional to 68,587.20, 103,053.60 and 43,639.20 is: 65,568.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,587.20 : 103,053.60 = 43,639.20 : x
  2. Step 2: Convert to fraction form
    68,587.20/103,053.60 = 43,639.20/x
  3. Step 3: Cross multiply
    68,587.20x = 103,053.60 × 43,639.20
  4. Step 4: Simplify right side
    68,587.20x = 4,497,176,661.12
  5. Step 5: Solve for x
    x = 4,497,176,661.12/68,587.20
  6. Step 6: Final answer
    x = 65,568.75

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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.