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Finding the Fourth Proportional to 215,807.40, 323,613.90 and 82,643.40

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Solution

The fourth proportional to 215,807.40, 323,613.90 and 82,643.40 is: 123,927.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,807.40 : 323,613.90 = 82,643.40 : x
  2. Step 2: Convert to fraction form
    215,807.40/323,613.90 = 82,643.40/x
  3. Step 3: Cross multiply
    215,807.40x = 323,613.90 × 82,643.40
  4. Step 4: Simplify right side
    215,807.40x = 26,744,552,983.26
  5. Step 5: Solve for x
    x = 26,744,552,983.26/215,807.40
  6. Step 6: Final answer
    x = 123,927.88

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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.