Home / 280,916.73-421,387.40-81,257.30

Finding the Fourth Proportional to 280,916.73, 421,387.40 and 81,257.30

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Solution

The fourth proportional to 280,916.73, 421,387.40 and 81,257.30 is: 121,889.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,916.73 : 421,387.40 = 81,257.30 : x
  2. Step 2: Convert to fraction form
    280,916.73/421,387.40 = 81,257.30/x
  3. Step 3: Cross multiply
    280,916.73x = 421,387.40 × 81,257.30
  4. Step 4: Simplify right side
    280,916.73x = 34,240,802,378.02
  5. Step 5: Solve for x
    x = 34,240,802,378.02/280,916.73
  6. Step 6: Final answer
    x = 121,889.51

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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.