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Finding the Fourth Proportional to 12,456.55, 18,695.76 and 6,916.15

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Solution

The fourth proportional to 12,456.55, 18,695.76 and 6,916.15 is: 10,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456.55 : 18,695.76 = 6,916.15 : x
  2. Step 2: Convert to fraction form
    12,456.55/18,695.76 = 6,916.15/x
  3. Step 3: Cross multiply
    12,456.55x = 18,695.76 × 6,916.15
  4. Step 4: Simplify right side
    12,456.55x = 129,302,680.52
  5. Step 5: Solve for x
    x = 129,302,680.52/12,456.55
  6. Step 6: Final answer
    x = 10,380.30

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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.