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Finding the Fourth Proportional to 88,411.20, 132,616.80 and 86,661.60

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Solution

The fourth proportional to 88,411.20, 132,616.80 and 86,661.60 is: 129,992.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,411.20 : 132,616.80 = 86,661.60 : x
  2. Step 2: Convert to fraction form
    88,411.20/132,616.80 = 86,661.60/x
  3. Step 3: Cross multiply
    88,411.20x = 132,616.80 × 86,661.60
  4. Step 4: Simplify right side
    88,411.20x = 11,492,784,074.88
  5. Step 5: Solve for x
    x = 11,492,784,074.88/88,411.20
  6. Step 6: Final answer
    x = 129,992.40

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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.