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Finding the Fourth Proportional to 787.30, 1,086.86 and 609.86

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Solution

The fourth proportional to 787.30, 1,086.86 and 609.86 is: 841.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.30 : 1,086.86 = 609.86 : x
  2. Step 2: Convert to fraction form
    787.30/1,086.86 = 609.86/x
  3. Step 3: Cross multiply
    787.30x = 1,086.86 × 609.86
  4. Step 4: Simplify right side
    787.30x = 662,829.39
  5. Step 5: Solve for x
    x = 662,829.39/787.30
  6. Step 6: Final answer
    x = 841.91

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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.