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Finding the Fourth Proportional to 787.09, 1,086.15 and 437.80

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Solution

The fourth proportional to 787.09, 1,086.15 and 437.80 is: 604.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.09 : 1,086.15 = 437.80 : x
  2. Step 2: Convert to fraction form
    787.09/1,086.15 = 437.80/x
  3. Step 3: Cross multiply
    787.09x = 1,086.15 × 437.80
  4. Step 4: Simplify right side
    787.09x = 475,516.47
  5. Step 5: Solve for x
    x = 475,516.47/787.09
  6. Step 6: Final answer
    x = 604.14

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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.