Home / 81,154.06-121,738-21,190.48

Finding the Fourth Proportional to 81,154.06, 121,738 and 21,190.48

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Solution

The fourth proportional to 81,154.06, 121,738 and 21,190.48 is: 31,787.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,154.06 : 121,738 = 21,190.48 : x
  2. Step 2: Convert to fraction form
    81,154.06/121,738 = 21,190.48/x
  3. Step 3: Cross multiply
    81,154.06x = 121,738 × 21,190.48
  4. Step 4: Simplify right side
    81,154.06x = 2,579,686,654.24
  5. Step 5: Solve for x
    x = 2,579,686,654.24/81,154.06
  6. Step 6: Final answer
    x = 31,787.52

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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.