Home / 81,252.40-121,878.60-67,428.40

Finding the Fourth Proportional to 81,252.40, 121,878.60 and 67,428.40

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Solution

The fourth proportional to 81,252.40, 121,878.60 and 67,428.40 is: 101,142.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,252.40 : 121,878.60 = 67,428.40 : x
  2. Step 2: Convert to fraction form
    81,252.40/121,878.60 = 67,428.40/x
  3. Step 3: Cross multiply
    81,252.40x = 121,878.60 × 67,428.40
  4. Step 4: Simplify right side
    81,252.40x = 8,218,078,992.24
  5. Step 5: Solve for x
    x = 8,218,078,992.24/81,252.40
  6. Step 6: Final answer
    x = 101,142.60

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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.