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Finding the Fourth Proportional to 1,776.31, 2,664.47 and 621.79

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Solution

The fourth proportional to 1,776.31, 2,664.47 and 621.79 is: 932.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.31 : 2,664.47 = 621.79 : x
  2. Step 2: Convert to fraction form
    1,776.31/2,664.47 = 621.79/x
  3. Step 3: Cross multiply
    1,776.31x = 2,664.47 × 621.79
  4. Step 4: Simplify right side
    1,776.31x = 1,656,740.80
  5. Step 5: Solve for x
    x = 1,656,740.80/1,776.31
  6. Step 6: Final answer
    x = 932.69

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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.