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Finding the Fourth Proportional to 90,208.40, 135,053.40 and 80,877.20

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Solution

The fourth proportional to 90,208.40, 135,053.40 and 80,877.20 is: 121,083.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,208.40 : 135,053.40 = 80,877.20 : x
  2. Step 2: Convert to fraction form
    90,208.40/135,053.40 = 80,877.20/x
  3. Step 3: Cross multiply
    90,208.40x = 135,053.40 × 80,877.20
  4. Step 4: Simplify right side
    90,208.40x = 10,922,740,842.48
  5. Step 5: Solve for x
    x = 10,922,740,842.48/90,208.40
  6. Step 6: Final answer
    x = 121,083.41

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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.