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Finding the Fourth Proportional to 211,908, 318,007.80 and 87,249

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Solution

The fourth proportional to 211,908, 318,007.80 and 87,249 is: 130,933.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,908 : 318,007.80 = 87,249 : x
  2. Step 2: Convert to fraction form
    211,908/318,007.80 = 87,249/x
  3. Step 3: Cross multiply
    211,908x = 318,007.80 × 87,249
  4. Step 4: Simplify right side
    211,908x = 27,745,862,542.20
  5. Step 5: Solve for x
    x = 27,745,862,542.20/211,908
  6. Step 6: Final answer
    x = 130,933.53

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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.