Home / 81,325.48-121,986.78-31,416.52

Finding the Fourth Proportional to 81,325.48, 121,986.78 and 31,416.52

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Solution

The fourth proportional to 81,325.48, 121,986.78 and 31,416.52 is: 47,124.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,325.48 : 121,986.78 = 31,416.52 : x
  2. Step 2: Convert to fraction form
    81,325.48/121,986.78 = 31,416.52/x
  3. Step 3: Cross multiply
    81,325.48x = 121,986.78 × 31,416.52
  4. Step 4: Simplify right side
    81,325.48x = 3,832,400,113.61
  5. Step 5: Solve for x
    x = 3,832,400,113.61/81,325.48
  6. Step 6: Final answer
    x = 47,124.22

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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.