Home / 80,981.78-121,513.68-54,631.17

Finding the Fourth Proportional to 80,981.78, 121,513.68 and 54,631.17

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Solution

The fourth proportional to 80,981.78, 121,513.68 and 54,631.17 is: 81,974.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,981.78 : 121,513.68 = 54,631.17 : x
  2. Step 2: Convert to fraction form
    80,981.78/121,513.68 = 54,631.17/x
  3. Step 3: Cross multiply
    80,981.78x = 121,513.68 × 54,631.17
  4. Step 4: Simplify right side
    80,981.78x = 6,638,434,509.41
  5. Step 5: Solve for x
    x = 6,638,434,509.41/80,981.78
  6. Step 6: Final answer
    x = 81,974.43

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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.