Home / 280,828.20-421,242.30-81,155.10

Finding the Fourth Proportional to 280,828.20, 421,242.30 and 81,155.10

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Solution

The fourth proportional to 280,828.20, 421,242.30 and 81,155.10 is: 121,732.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,828.20 : 421,242.30 = 81,155.10 : x
  2. Step 2: Convert to fraction form
    280,828.20/421,242.30 = 81,155.10/x
  3. Step 3: Cross multiply
    280,828.20x = 421,242.30 × 81,155.10
  4. Step 4: Simplify right side
    280,828.20x = 34,185,960,980.73
  5. Step 5: Solve for x
    x = 34,185,960,980.73/280,828.20
  6. Step 6: Final answer
    x = 121,732.65

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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.