Home / 128,972.56-178,065.12-88,673.44

Finding the Fourth Proportional to 128,972.56, 178,065.12 and 88,673.44

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Solution

The fourth proportional to 128,972.56, 178,065.12 and 88,673.44 is: 122,426.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,972.56 : 178,065.12 = 88,673.44 : x
  2. Step 2: Convert to fraction form
    128,972.56/178,065.12 = 88,673.44/x
  3. Step 3: Cross multiply
    128,972.56x = 178,065.12 × 88,673.44
  4. Step 4: Simplify right side
    128,972.56x = 15,789,646,734.41
  5. Step 5: Solve for x
    x = 15,789,646,734.41/128,972.56
  6. Step 6: Final answer
    x = 122,426.40

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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.