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Finding the Fourth Proportional to 280,865.70, 421,321.75 and 91,321.76

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Solution

The fourth proportional to 280,865.70, 421,321.75 and 91,321.76 is: 136,990.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,865.70 : 421,321.75 = 91,321.76 : x
  2. Step 2: Convert to fraction form
    280,865.70/421,321.75 = 91,321.76/x
  3. Step 3: Cross multiply
    280,865.70x = 421,321.75 × 91,321.76
  4. Step 4: Simplify right side
    280,865.70x = 38,475,844,561.28
  5. Step 5: Solve for x
    x = 38,475,844,561.28/280,865.70
  6. Step 6: Final answer
    x = 136,990.19

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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.