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Finding the Fourth Proportional to 787.91, 1,086.93 and 492.66

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Solution

The fourth proportional to 787.91, 1,086.93 and 492.66 is: 679.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.91 : 1,086.93 = 492.66 : x
  2. Step 2: Convert to fraction form
    787.91/1,086.93 = 492.66/x
  3. Step 3: Cross multiply
    787.91x = 1,086.93 × 492.66
  4. Step 4: Simplify right side
    787.91x = 535,486.93
  5. Step 5: Solve for x
    x = 535,486.93/787.91
  6. Step 6: Final answer
    x = 679.63

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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.