Home / 81,201.28-121,726.80-31,266.40

Finding the Fourth Proportional to 81,201.28, 121,726.80 and 31,266.40

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Solution

The fourth proportional to 81,201.28, 121,726.80 and 31,266.40 is: 46,870.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,201.28 : 121,726.80 = 31,266.40 : x
  2. Step 2: Convert to fraction form
    81,201.28/121,726.80 = 31,266.40/x
  3. Step 3: Cross multiply
    81,201.28x = 121,726.80 × 31,266.40
  4. Step 4: Simplify right side
    81,201.28x = 3,805,958,819.52
  5. Step 5: Solve for x
    x = 3,805,958,819.52/81,201.28
  6. Step 6: Final answer
    x = 46,870.68

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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.