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Finding the Fourth Proportional to 766.53, 1,056.78 and 609.69

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Solution

The fourth proportional to 766.53, 1,056.78 and 609.69 is: 840.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.53 : 1,056.78 = 609.69 : x
  2. Step 2: Convert to fraction form
    766.53/1,056.78 = 609.69/x
  3. Step 3: Cross multiply
    766.53x = 1,056.78 × 609.69
  4. Step 4: Simplify right side
    766.53x = 644,308.20
  5. Step 5: Solve for x
    x = 644,308.20/766.53
  6. Step 6: Final answer
    x = 840.55

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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.