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Finding the Fourth Proportional to 88,689.20, 133,033.80 and 86,939.60

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Solution

The fourth proportional to 88,689.20, 133,033.80 and 86,939.60 is: 130,409.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,689.20 : 133,033.80 = 86,939.60 : x
  2. Step 2: Convert to fraction form
    88,689.20/133,033.80 = 86,939.60/x
  3. Step 3: Cross multiply
    88,689.20x = 133,033.80 × 86,939.60
  4. Step 4: Simplify right side
    88,689.20x = 11,565,905,358.48
  5. Step 5: Solve for x
    x = 11,565,905,358.48/88,689.20
  6. Step 6: Final answer
    x = 130,409.40

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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.