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Finding the Fourth Proportional to 3,669.68, 5,490.88 and 2,189.70

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Solution

The fourth proportional to 3,669.68, 5,490.88 and 2,189.70 is: 3,276.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,669.68 : 5,490.88 = 2,189.70 : x
  2. Step 2: Convert to fraction form
    3,669.68/5,490.88 = 2,189.70/x
  3. Step 3: Cross multiply
    3,669.68x = 5,490.88 × 2,189.70
  4. Step 4: Simplify right side
    3,669.68x = 12,023,341.53
  5. Step 5: Solve for x
    x = 12,023,341.53/3,669.68
  6. Step 6: Final answer
    x = 3,276.40

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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.