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Finding the Fourth Proportional to 45,519, 68,278.54 and 12,687

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Solution

The fourth proportional to 45,519, 68,278.54 and 12,687 is: 19,030.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,519 : 68,278.54 = 12,687 : x
  2. Step 2: Convert to fraction form
    45,519/68,278.54 = 12,687/x
  3. Step 3: Cross multiply
    45,519x = 68,278.54 × 12,687
  4. Step 4: Simplify right side
    45,519x = 866,249,836.98
  5. Step 5: Solve for x
    x = 866,249,836.98/45,519
  6. Step 6: Final answer
    x = 19,030.51

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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.