Home / 280,844.16-421,204.16-81,121.20

Finding the Fourth Proportional to 280,844.16, 421,204.16 and 81,121.20

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Solution

The fourth proportional to 280,844.16, 421,204.16 and 81,121.20 is: 121,663.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,844.16 : 421,204.16 = 81,121.20 : x
  2. Step 2: Convert to fraction form
    280,844.16/421,204.16 = 81,121.20/x
  3. Step 3: Cross multiply
    280,844.16x = 421,204.16 × 81,121.20
  4. Step 4: Simplify right side
    280,844.16x = 34,168,586,904.19
  5. Step 5: Solve for x
    x = 34,168,586,904.19/280,844.16
  6. Step 6: Final answer
    x = 121,663.87

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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.