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Finding the Fourth Proportional to 1,443.48, 2,165.10 and 518.87

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Solution

The fourth proportional to 1,443.48, 2,165.10 and 518.87 is: 778.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.48 : 2,165.10 = 518.87 : x
  2. Step 2: Convert to fraction form
    1,443.48/2,165.10 = 518.87/x
  3. Step 3: Cross multiply
    1,443.48x = 2,165.10 × 518.87
  4. Step 4: Simplify right side
    1,443.48x = 1,123,394.61
  5. Step 5: Solve for x
    x = 1,123,394.61/1,443.48
  6. Step 6: Final answer
    x = 778.25

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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.