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Finding the Fourth Proportional to 121,420.80, 182,131.20 and 85,991.40

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Solution

The fourth proportional to 121,420.80, 182,131.20 and 85,991.40 is: 128,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,420.80 : 182,131.20 = 85,991.40 : x
  2. Step 2: Convert to fraction form
    121,420.80/182,131.20 = 85,991.40/x
  3. Step 3: Cross multiply
    121,420.80x = 182,131.20 × 85,991.40
  4. Step 4: Simplify right side
    121,420.80x = 15,661,716,871.68
  5. Step 5: Solve for x
    x = 15,661,716,871.68/121,420.80
  6. Step 6: Final answer
    x = 128,987.10

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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.