Home / 128,979.34-178,002.66-71,629.72

Finding the Fourth Proportional to 128,979.34, 178,002.66 and 71,629.72

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Solution

The fourth proportional to 128,979.34, 178,002.66 and 71,629.72 is: 98,855.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.34 : 178,002.66 = 71,629.72 : x
  2. Step 2: Convert to fraction form
    128,979.34/178,002.66 = 71,629.72/x
  3. Step 3: Cross multiply
    128,979.34x = 178,002.66 × 71,629.72
  4. Step 4: Simplify right side
    128,979.34x = 12,750,280,518.66
  5. Step 5: Solve for x
    x = 12,750,280,518.66/128,979.34
  6. Step 6: Final answer
    x = 98,855.22

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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.