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Finding the Fourth Proportional to 12,479.78, 18,703.95 and 10,916.06

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Solution

The fourth proportional to 12,479.78, 18,703.95 and 10,916.06 is: 16,360.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.78 : 18,703.95 = 10,916.06 : x
  2. Step 2: Convert to fraction form
    12,479.78/18,703.95 = 10,916.06/x
  3. Step 3: Cross multiply
    12,479.78x = 18,703.95 × 10,916.06
  4. Step 4: Simplify right side
    12,479.78x = 204,173,440.44
  5. Step 5: Solve for x
    x = 204,173,440.44/12,479.78
  6. Step 6: Final answer
    x = 16,360.34

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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.