Home / 138,807.36-191,542.59-81,440.69

Finding the Fourth Proportional to 138,807.36, 191,542.59 and 81,440.69

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Solution

The fourth proportional to 138,807.36, 191,542.59 and 81,440.69 is: 112,381.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,807.36 : 191,542.59 = 81,440.69 : x
  2. Step 2: Convert to fraction form
    138,807.36/191,542.59 = 81,440.69/x
  3. Step 3: Cross multiply
    138,807.36x = 191,542.59 × 81,440.69
  4. Step 4: Simplify right side
    138,807.36x = 15,599,359,736.27
  5. Step 5: Solve for x
    x = 15,599,359,736.27/138,807.36
  6. Step 6: Final answer
    x = 112,381.36

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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.