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Finding the Fourth Proportional to 12,220.70, 18,331.65 and 6,388.70

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Solution

The fourth proportional to 12,220.70, 18,331.65 and 6,388.70 is: 9,583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,220.70 : 18,331.65 = 6,388.70 : x
  2. Step 2: Convert to fraction form
    12,220.70/18,331.65 = 6,388.70/x
  3. Step 3: Cross multiply
    12,220.70x = 18,331.65 × 6,388.70
  4. Step 4: Simplify right side
    12,220.70x = 117,115,412.36
  5. Step 5: Solve for x
    x = 117,115,412.36/12,220.70
  6. Step 6: Final answer
    x = 9,583.36

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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.