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Finding the Fourth Proportional to 1,179.72, 1,627.74 and 787.20

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Solution

The fourth proportional to 1,179.72, 1,627.74 and 787.20 is: 1,086.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.72 : 1,627.74 = 787.20 : x
  2. Step 2: Convert to fraction form
    1,179.72/1,627.74 = 787.20/x
  3. Step 3: Cross multiply
    1,179.72x = 1,627.74 × 787.20
  4. Step 4: Simplify right side
    1,179.72x = 1,281,356.93
  5. Step 5: Solve for x
    x = 1,281,356.93/1,179.72
  6. Step 6: Final answer
    x = 1,086.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.