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Finding the Fourth Proportional to 128,243.91, 176,976.23 and 71,655.33

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Solution

The fourth proportional to 128,243.91, 176,976.23 and 71,655.33 is: 98,884.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,243.91 : 176,976.23 = 71,655.33 : x
  2. Step 2: Convert to fraction form
    128,243.91/176,976.23 = 71,655.33/x
  3. Step 3: Cross multiply
    128,243.91x = 176,976.23 × 71,655.33
  4. Step 4: Simplify right side
    128,243.91x = 12,681,289,804.53
  5. Step 5: Solve for x
    x = 12,681,289,804.53/128,243.91
  6. Step 6: Final answer
    x = 98,884.15

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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.