Home / 129,084.19-178,138.47-71,728.81

Finding the Fourth Proportional to 129,084.19, 178,138.47 and 71,728.81

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Solution

The fourth proportional to 129,084.19, 178,138.47 and 71,728.81 is: 98,987.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,084.19 : 178,138.47 = 71,728.81 : x
  2. Step 2: Convert to fraction form
    129,084.19/178,138.47 = 71,728.81/x
  3. Step 3: Cross multiply
    129,084.19x = 178,138.47 × 71,728.81
  4. Step 4: Simplify right side
    129,084.19x = 12,777,660,468.32
  5. Step 5: Solve for x
    x = 12,777,660,468.32/129,084.19
  6. Step 6: Final answer
    x = 98,987.03

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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.