Home / 81,391.15-121,867.98-51,647.95

Finding the Fourth Proportional to 81,391.15, 121,867.98 and 51,647.95

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Solution

The fourth proportional to 81,391.15, 121,867.98 and 51,647.95 is: 77,333.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,391.15 : 121,867.98 = 51,647.95 : x
  2. Step 2: Convert to fraction form
    81,391.15/121,867.98 = 51,647.95/x
  3. Step 3: Cross multiply
    81,391.15x = 121,867.98 × 51,647.95
  4. Step 4: Simplify right side
    81,391.15x = 6,294,231,337.64
  5. Step 5: Solve for x
    x = 6,294,231,337.64/81,391.15
  6. Step 6: Final answer
    x = 77,333.12

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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.