Home / 138,666.09-191,342.75-78,233.21

Finding the Fourth Proportional to 138,666.09, 191,342.75 and 78,233.21

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Solution

The fourth proportional to 138,666.09, 191,342.75 and 78,233.21 is: 107,952.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,666.09 : 191,342.75 = 78,233.21 : x
  2. Step 2: Convert to fraction form
    138,666.09/191,342.75 = 78,233.21/x
  3. Step 3: Cross multiply
    138,666.09x = 191,342.75 × 78,233.21
  4. Step 4: Simplify right side
    138,666.09x = 14,969,356,586.01
  5. Step 5: Solve for x
    x = 14,969,356,586.01/138,666.09
  6. Step 6: Final answer
    x = 107,952.54

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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.