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Finding the Fourth Proportional to 2,431.72, 3,646.80 and 787.93

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Solution

The fourth proportional to 2,431.72, 3,646.80 and 787.93 is: 1,181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,431.72 : 3,646.80 = 787.93 : x
  2. Step 2: Convert to fraction form
    2,431.72/3,646.80 = 787.93/x
  3. Step 3: Cross multiply
    2,431.72x = 3,646.80 × 787.93
  4. Step 4: Simplify right side
    2,431.72x = 2,873,414.01
  5. Step 5: Solve for x
    x = 2,873,414.01/2,431.72
  6. Step 6: Final answer
    x = 1,181.64

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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.