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Finding the Fourth Proportional to 84,550.34, 126,815.78 and 28,388.18

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Solution

The fourth proportional to 84,550.34, 126,815.78 and 28,388.18 is: 42,579.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,550.34 : 126,815.78 = 28,388.18 : x
  2. Step 2: Convert to fraction form
    84,550.34/126,815.78 = 28,388.18/x
  3. Step 3: Cross multiply
    84,550.34x = 126,815.78 × 28,388.18
  4. Step 4: Simplify right side
    84,550.34x = 3,600,069,189.48
  5. Step 5: Solve for x
    x = 3,600,069,189.48/84,550.34
  6. Step 6: Final answer
    x = 42,579.00

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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.