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Finding the Fourth Proportional to 18,916.42, 28,372.66 and 8,386.63

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Solution

The fourth proportional to 18,916.42, 28,372.66 and 8,386.63 is: 12,579.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.42 : 28,372.66 = 8,386.63 : x
  2. Step 2: Convert to fraction form
    18,916.42/28,372.66 = 8,386.63/x
  3. Step 3: Cross multiply
    18,916.42x = 28,372.66 × 8,386.63
  4. Step 4: Simplify right side
    18,916.42x = 237,951,001.54
  5. Step 5: Solve for x
    x = 237,951,001.54/18,916.42
  6. Step 6: Final answer
    x = 12,579.07

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1.5x scale

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.