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Finding the Fourth Proportional to 88,911.80, 133,039.65 and 81,038.60

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Solution

The fourth proportional to 88,911.80, 133,039.65 and 81,038.60 is: 121,258.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,911.80 : 133,039.65 = 81,038.60 : x
  2. Step 2: Convert to fraction form
    88,911.80/133,039.65 = 81,038.60/x
  3. Step 3: Cross multiply
    88,911.80x = 133,039.65 × 81,038.60
  4. Step 4: Simplify right side
    88,911.80x = 10,781,346,980.49
  5. Step 5: Solve for x
    x = 10,781,346,980.49/88,911.80
  6. Step 6: Final answer
    x = 121,258.90

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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.