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Finding the Fourth Proportional to 2,621.31, 3,932.51 and 977.96

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Solution

The fourth proportional to 2,621.31, 3,932.51 and 977.96 is: 1,467.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,621.31 : 3,932.51 = 977.96 : x
  2. Step 2: Convert to fraction form
    2,621.31/3,932.51 = 977.96/x
  3. Step 3: Cross multiply
    2,621.31x = 3,932.51 × 977.96
  4. Step 4: Simplify right side
    2,621.31x = 3,845,812.93
  5. Step 5: Solve for x
    x = 3,845,812.93/2,621.31
  6. Step 6: Final answer
    x = 1,467.13

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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.