Home / 81,721.31-122,582.16-25,561.78

Finding the Fourth Proportional to 81,721.31, 122,582.16 and 25,561.78

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Solution

The fourth proportional to 81,721.31, 122,582.16 and 25,561.78 is: 38,342.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,721.31 : 122,582.16 = 25,561.78 : x
  2. Step 2: Convert to fraction form
    81,721.31/122,582.16 = 25,561.78/x
  3. Step 3: Cross multiply
    81,721.31x = 122,582.16 × 25,561.78
  4. Step 4: Simplify right side
    81,721.31x = 3,133,417,899.39
  5. Step 5: Solve for x
    x = 3,133,417,899.39/81,721.31
  6. Step 6: Final answer
    x = 38,342.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.