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Finding the Fourth Proportional to 81,130.80, 121,696.20 and 58,839.60

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Solution

The fourth proportional to 81,130.80, 121,696.20 and 58,839.60 is: 88,259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,130.80 : 121,696.20 = 58,839.60 : x
  2. Step 2: Convert to fraction form
    81,130.80/121,696.20 = 58,839.60/x
  3. Step 3: Cross multiply
    81,130.80x = 121,696.20 × 58,839.60
  4. Step 4: Simplify right side
    81,130.80x = 7,160,555,729.52
  5. Step 5: Solve for x
    x = 7,160,555,729.52/81,130.80
  6. Step 6: Final answer
    x = 88,259.40

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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.