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Finding the Fourth Proportional to 8,720.70, 13,081.05 and 8,672.10

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Solution

The fourth proportional to 8,720.70, 13,081.05 and 8,672.10 is: 13,008.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.70 : 13,081.05 = 8,672.10 : x
  2. Step 2: Convert to fraction form
    8,720.70/13,081.05 = 8,672.10/x
  3. Step 3: Cross multiply
    8,720.70x = 13,081.05 × 8,672.10
  4. Step 4: Simplify right side
    8,720.70x = 113,440,173.71
  5. Step 5: Solve for x
    x = 113,440,173.71/8,720.70
  6. Step 6: Final answer
    x = 13,008.15

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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.