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Finding the Fourth Proportional to 109,078.80, 163,387.80 and 90,646.80

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Solution

The fourth proportional to 109,078.80, 163,387.80 and 90,646.80 is: 135,778.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,078.80 : 163,387.80 = 90,646.80 : x
  2. Step 2: Convert to fraction form
    109,078.80/163,387.80 = 90,646.80/x
  3. Step 3: Cross multiply
    109,078.80x = 163,387.80 × 90,646.80
  4. Step 4: Simplify right side
    109,078.80x = 14,810,581,229.04
  5. Step 5: Solve for x
    x = 14,810,581,229.04/109,078.80
  6. Step 6: Final answer
    x = 135,778.73

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1.5x scale

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.