Home / 129,287.12-178,519.56-83,987.60

Finding the Fourth Proportional to 129,287.12, 178,519.56 and 83,987.60

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Solution

The fourth proportional to 129,287.12, 178,519.56 and 83,987.60 is: 115,970.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,287.12 : 178,519.56 = 83,987.60 : x
  2. Step 2: Convert to fraction form
    129,287.12/178,519.56 = 83,987.60/x
  3. Step 3: Cross multiply
    129,287.12x = 178,519.56 × 83,987.60
  4. Step 4: Simplify right side
    129,287.12x = 14,993,429,397.46
  5. Step 5: Solve for x
    x = 14,993,429,397.46/129,287.12
  6. Step 6: Final answer
    x = 115,970.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.