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Finding the Fourth Proportional to 128,606.40, 177,472.71 and 71,243.37

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Solution

The fourth proportional to 128,606.40, 177,472.71 and 71,243.37 is: 98,313.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,606.40 : 177,472.71 = 71,243.37 : x
  2. Step 2: Convert to fraction form
    128,606.40/177,472.71 = 71,243.37/x
  3. Step 3: Cross multiply
    128,606.40x = 177,472.71 × 71,243.37
  4. Step 4: Simplify right side
    128,606.40x = 12,643,753,943.43
  5. Step 5: Solve for x
    x = 12,643,753,943.43/128,606.40
  6. Step 6: Final answer
    x = 98,313.57

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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.