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Finding the Fourth Proportional to 787.25, 1,086.55 and 507.85

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Solution

The fourth proportional to 787.25, 1,086.55 and 507.85 is: 700.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.25 : 1,086.55 = 507.85 : x
  2. Step 2: Convert to fraction form
    787.25/1,086.55 = 507.85/x
  3. Step 3: Cross multiply
    787.25x = 1,086.55 × 507.85
  4. Step 4: Simplify right side
    787.25x = 551,800.43
  5. Step 5: Solve for x
    x = 551,800.43/787.25
  6. Step 6: Final answer
    x = 700.92

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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.