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Finding the Fourth Proportional to 215,643.21, 323,514.02 and 65,904.79

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Solution

The fourth proportional to 215,643.21, 323,514.02 and 65,904.79 is: 98,872.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,643.21 : 323,514.02 = 65,904.79 : x
  2. Step 2: Convert to fraction form
    215,643.21/323,514.02 = 65,904.79/x
  3. Step 3: Cross multiply
    215,643.21x = 323,514.02 × 65,904.79
  4. Step 4: Simplify right side
    215,643.21x = 21,321,123,550.16
  5. Step 5: Solve for x
    x = 21,321,123,550.16/215,643.21
  6. Step 6: Final answer
    x = 98,872.22

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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.