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Finding the Fourth Proportional to 787.19, 1,086.29 and 437.90

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Solution

The fourth proportional to 787.19, 1,086.29 and 437.90 is: 604.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.19 : 1,086.29 = 437.90 : x
  2. Step 2: Convert to fraction form
    787.19/1,086.29 = 437.90/x
  3. Step 3: Cross multiply
    787.19x = 1,086.29 × 437.90
  4. Step 4: Simplify right side
    787.19x = 475,686.39
  5. Step 5: Solve for x
    x = 475,686.39/787.19
  6. Step 6: Final answer
    x = 604.28

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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.