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Finding the Fourth Proportional to 13,555, 18,700.68 and 8,517.16

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Solution

The fourth proportional to 13,555, 18,700.68 and 8,517.16 is: 11,750.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,555 : 18,700.68 = 8,517.16 : x
  2. Step 2: Convert to fraction form
    13,555/18,700.68 = 8,517.16/x
  3. Step 3: Cross multiply
    13,555x = 18,700.68 × 8,517.16
  4. Step 4: Simplify right side
    13,555x = 159,276,683.67
  5. Step 5: Solve for x
    x = 159,276,683.67/13,555
  6. Step 6: Final answer
    x = 11,750.40

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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.