Home / 280,788.16-421,120.14-81,065.12

Finding the Fourth Proportional to 280,788.16, 421,120.14 and 81,065.12

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Solution

The fourth proportional to 280,788.16, 421,120.14 and 81,065.12 is: 121,579.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,788.16 : 421,120.14 = 81,065.12 : x
  2. Step 2: Convert to fraction form
    280,788.16/421,120.14 = 81,065.12/x
  3. Step 3: Cross multiply
    280,788.16x = 421,120.14 × 81,065.12
  4. Step 4: Simplify right side
    280,788.16x = 34,138,154,683.52
  5. Step 5: Solve for x
    x = 34,138,154,683.52/280,788.16
  6. Step 6: Final answer
    x = 121,579.75

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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.