Home / 128,990.06-178,022.66-78,003.14

Finding the Fourth Proportional to 128,990.06, 178,022.66 and 78,003.14

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Solution

The fourth proportional to 128,990.06, 178,022.66 and 78,003.14 is: 107,654.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.06 : 178,022.66 = 78,003.14 : x
  2. Step 2: Convert to fraction form
    128,990.06/178,022.66 = 78,003.14/x
  3. Step 3: Cross multiply
    128,990.06x = 178,022.66 × 78,003.14
  4. Step 4: Simplify right side
    128,990.06x = 13,886,325,191.02
  5. Step 5: Solve for x
    x = 13,886,325,191.02/128,990.06
  6. Step 6: Final answer
    x = 107,654.23

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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.