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Finding the Fourth Proportional to 2,431.54, 3,646.54 and 787.71

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Solution

The fourth proportional to 2,431.54, 3,646.54 and 787.71 is: 1,181.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,431.54 : 3,646.54 = 787.71 : x
  2. Step 2: Convert to fraction form
    2,431.54/3,646.54 = 787.71/x
  3. Step 3: Cross multiply
    2,431.54x = 3,646.54 × 787.71
  4. Step 4: Simplify right side
    2,431.54x = 2,872,416.02
  5. Step 5: Solve for x
    x = 2,872,416.02/2,431.54
  6. Step 6: Final answer
    x = 1,181.32

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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.