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Finding the Fourth Proportional to 1,443.78, 2,165.54 and 621.90

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Solution

The fourth proportional to 1,443.78, 2,165.54 and 621.90 is: 932.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.78 : 2,165.54 = 621.90 : x
  2. Step 2: Convert to fraction form
    1,443.78/2,165.54 = 621.90/x
  3. Step 3: Cross multiply
    1,443.78x = 2,165.54 × 621.90
  4. Step 4: Simplify right side
    1,443.78x = 1,346,746.22
  5. Step 5: Solve for x
    x = 1,346,746.22/1,443.78
  6. Step 6: Final answer
    x = 932.79

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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.