Home / 128,739.38-177,670.80-71,384.40

Finding the Fourth Proportional to 128,739.38, 177,670.80 and 71,384.40

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Solution

The fourth proportional to 128,739.38, 177,670.80 and 71,384.40 is: 98,516.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,739.38 : 177,670.80 = 71,384.40 : x
  2. Step 2: Convert to fraction form
    128,739.38/177,670.80 = 71,384.40/x
  3. Step 3: Cross multiply
    128,739.38x = 177,670.80 × 71,384.40
  4. Step 4: Simplify right side
    128,739.38x = 12,682,923,455.52
  5. Step 5: Solve for x
    x = 12,682,923,455.52/128,739.38
  6. Step 6: Final answer
    x = 98,516.27

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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.