Home / 280,828.40-421,242.60-81,155.30

Finding the Fourth Proportional to 280,828.40, 421,242.60 and 81,155.30

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Solution

The fourth proportional to 280,828.40, 421,242.60 and 81,155.30 is: 121,732.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,828.40 : 421,242.60 = 81,155.30 : x
  2. Step 2: Convert to fraction form
    280,828.40/421,242.60 = 81,155.30/x
  3. Step 3: Cross multiply
    280,828.40x = 421,242.60 × 81,155.30
  4. Step 4: Simplify right side
    280,828.40x = 34,186,069,575.78
  5. Step 5: Solve for x
    x = 34,186,069,575.78/280,828.40
  6. Step 6: Final answer
    x = 121,732.95

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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.