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Finding the Fourth Proportional to 2,220, 3,063.60 and 1,288.68

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Solution

The fourth proportional to 2,220, 3,063.60 and 1,288.68 is: 1,778.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220 : 3,063.60 = 1,288.68 : x
  2. Step 2: Convert to fraction form
    2,220/3,063.60 = 1,288.68/x
  3. Step 3: Cross multiply
    2,220x = 3,063.60 × 1,288.68
  4. Step 4: Simplify right side
    2,220x = 3,948,000.05
  5. Step 5: Solve for x
    x = 3,948,000.05/2,220
  6. Step 6: Final answer
    x = 1,778.38

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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.