Home / 81,018.81-121,515.93-31,122.41

Finding the Fourth Proportional to 81,018.81, 121,515.93 and 31,122.41

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Solution

The fourth proportional to 81,018.81, 121,515.93 and 31,122.41 is: 46,678.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018.81 : 121,515.93 = 31,122.41 : x
  2. Step 2: Convert to fraction form
    81,018.81/121,515.93 = 31,122.41/x
  3. Step 3: Cross multiply
    81,018.81x = 121,515.93 × 31,122.41
  4. Step 4: Simplify right side
    81,018.81x = 3,781,867,987.41
  5. Step 5: Solve for x
    x = 3,781,867,987.41/81,018.81
  6. Step 6: Final answer
    x = 46,678.89

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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.