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Finding the Fourth Proportional to 88,709.20, 133,063.80 and 86,959.60

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Solution

The fourth proportional to 88,709.20, 133,063.80 and 86,959.60 is: 130,439.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,709.20 : 133,063.80 = 86,959.60 : x
  2. Step 2: Convert to fraction form
    88,709.20/133,063.80 = 86,959.60/x
  3. Step 3: Cross multiply
    88,709.20x = 133,063.80 × 86,959.60
  4. Step 4: Simplify right side
    88,709.20x = 11,571,174,822.48
  5. Step 5: Solve for x
    x = 11,571,174,822.48/88,709.20
  6. Step 6: Final answer
    x = 130,439.40

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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.