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Finding the Fourth Proportional to 787.32, 1,180.98 and 665.21

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Solution

The fourth proportional to 787.32, 1,180.98 and 665.21 is: 997.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.32 : 1,180.98 = 665.21 : x
  2. Step 2: Convert to fraction form
    787.32/1,180.98 = 665.21/x
  3. Step 3: Cross multiply
    787.32x = 1,180.98 × 665.21
  4. Step 4: Simplify right side
    787.32x = 785,602.66
  5. Step 5: Solve for x
    x = 785,602.66/787.32
  6. Step 6: Final answer
    x = 997.82

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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.