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Finding the Fourth Proportional to 1,392.90, 2,089.55 and 418.87

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Solution

The fourth proportional to 1,392.90, 2,089.55 and 418.87 is: 628.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.90 : 2,089.55 = 418.87 : x
  2. Step 2: Convert to fraction form
    1,392.90/2,089.55 = 418.87/x
  3. Step 3: Cross multiply
    1,392.90x = 2,089.55 × 418.87
  4. Step 4: Simplify right side
    1,392.90x = 875,251.11
  5. Step 5: Solve for x
    x = 875,251.11/1,392.90
  6. Step 6: Final answer
    x = 628.37

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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.