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Finding the Fourth Proportional to 1,398.42, 2,097.12 and 520.71

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Solution

The fourth proportional to 1,398.42, 2,097.12 and 520.71 is: 780.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.42 : 2,097.12 = 520.71 : x
  2. Step 2: Convert to fraction form
    1,398.42/2,097.12 = 520.71/x
  3. Step 3: Cross multiply
    1,398.42x = 2,097.12 × 520.71
  4. Step 4: Simplify right side
    1,398.42x = 1,091,991.36
  5. Step 5: Solve for x
    x = 1,091,991.36/1,398.42
  6. Step 6: Final answer
    x = 780.88

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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.