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Finding the Fourth Proportional to 3,390.89, 4,679.20 and 1,898.80

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Solution

The fourth proportional to 3,390.89, 4,679.20 and 1,898.80 is: 2,620.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.89 : 4,679.20 = 1,898.80 : x
  2. Step 2: Convert to fraction form
    3,390.89/4,679.20 = 1,898.80/x
  3. Step 3: Cross multiply
    3,390.89x = 4,679.20 × 1,898.80
  4. Step 4: Simplify right side
    3,390.89x = 8,884,832.07
  5. Step 5: Solve for x
    x = 8,884,832.07/3,390.89
  6. Step 6: Final answer
    x = 2,620.21

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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.