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Finding the Fourth Proportional to 13,613.16, 18,787.86 and 8,308.20

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Solution

The fourth proportional to 13,613.16, 18,787.86 and 8,308.20 is: 11,466.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.16 : 18,787.86 = 8,308.20 : x
  2. Step 2: Convert to fraction form
    13,613.16/18,787.86 = 8,308.20/x
  3. Step 3: Cross multiply
    13,613.16x = 18,787.86 × 8,308.20
  4. Step 4: Simplify right side
    13,613.16x = 156,093,298.45
  5. Step 5: Solve for x
    x = 156,093,298.45/13,613.16
  6. Step 6: Final answer
    x = 11,466.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.