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Finding the Fourth Proportional to 787.34, 1,086.37 and 669.79

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Solution

The fourth proportional to 787.34, 1,086.37 and 669.79 is: 924.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.34 : 1,086.37 = 669.79 : x
  2. Step 2: Convert to fraction form
    787.34/1,086.37 = 669.79/x
  3. Step 3: Cross multiply
    787.34x = 1,086.37 × 669.79
  4. Step 4: Simplify right side
    787.34x = 727,639.76
  5. Step 5: Solve for x
    x = 727,639.76/787.34
  6. Step 6: Final answer
    x = 924.17

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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.