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Finding the Fourth Proportional to 639,278.28, 959,073.54 and 212,813.28

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Solution

The fourth proportional to 639,278.28, 959,073.54 and 212,813.28 is: 319,271.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,278.28 : 959,073.54 = 212,813.28 : x
  2. Step 2: Convert to fraction form
    639,278.28/959,073.54 = 212,813.28/x
  3. Step 3: Cross multiply
    639,278.28x = 959,073.54 × 212,813.28
  4. Step 4: Simplify right side
    639,278.28x = 204,103,585,808.61
  5. Step 5: Solve for x
    x = 204,103,585,808.61/639,278.28
  6. Step 6: Final answer
    x = 319,271.89

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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.