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Finding the Fourth Proportional to 12,854.60, 19,278.12 and 5,459

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Solution

The fourth proportional to 12,854.60, 19,278.12 and 5,459 is: 8,186.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,854.60 : 19,278.12 = 5,459 : x
  2. Step 2: Convert to fraction form
    12,854.60/19,278.12 = 5,459/x
  3. Step 3: Cross multiply
    12,854.60x = 19,278.12 × 5,459
  4. Step 4: Simplify right side
    12,854.60x = 105,239,257.08
  5. Step 5: Solve for x
    x = 105,239,257.08/12,854.60
  6. Step 6: Final answer
    x = 8,186.89

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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.