Home / 1,398.20-2,096.61-520.44

Finding the Fourth Proportional to 1,398.20, 2,096.61 and 520.44

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Solution

The fourth proportional to 1,398.20, 2,096.61 and 520.44 is: 780.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.20 : 2,096.61 = 520.44 : x
  2. Step 2: Convert to fraction form
    1,398.20/2,096.61 = 520.44/x
  3. Step 3: Cross multiply
    1,398.20x = 2,096.61 × 520.44
  4. Step 4: Simplify right side
    1,398.20x = 1,091,159.71
  5. Step 5: Solve for x
    x = 1,091,159.71/1,398.20
  6. Step 6: Final answer
    x = 780.40

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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.