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Finding the Fourth Proportional to 8,685.40, 13,008.90 and 6,722.20

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Solution

The fourth proportional to 8,685.40, 13,008.90 and 6,722.20 is: 10,068.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.40 : 13,008.90 = 6,722.20 : x
  2. Step 2: Convert to fraction form
    8,685.40/13,008.90 = 6,722.20/x
  3. Step 3: Cross multiply
    8,685.40x = 13,008.90 × 6,722.20
  4. Step 4: Simplify right side
    8,685.40x = 87,448,427.58
  5. Step 5: Solve for x
    x = 87,448,427.58/8,685.40
  6. Step 6: Final answer
    x = 10,068.44

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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.