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Finding the Fourth Proportional to 121,103.80, 181,655.70 and 89,999.80

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Solution

The fourth proportional to 121,103.80, 181,655.70 and 89,999.80 is: 134,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,103.80 : 181,655.70 = 89,999.80 : x
  2. Step 2: Convert to fraction form
    121,103.80/181,655.70 = 89,999.80/x
  3. Step 3: Cross multiply
    121,103.80x = 181,655.70 × 89,999.80
  4. Step 4: Simplify right side
    121,103.80x = 16,348,976,668.86
  5. Step 5: Solve for x
    x = 16,348,976,668.86/121,103.80
  6. Step 6: Final answer
    x = 134,999.70

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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.