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Finding the Fourth Proportional to 771.35, 1,064.46 and 439.78

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Solution

The fourth proportional to 771.35, 1,064.46 and 439.78 is: 606.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.35 : 1,064.46 = 439.78 : x
  2. Step 2: Convert to fraction form
    771.35/1,064.46 = 439.78/x
  3. Step 3: Cross multiply
    771.35x = 1,064.46 × 439.78
  4. Step 4: Simplify right side
    771.35x = 468,124.97
  5. Step 5: Solve for x
    x = 468,124.97/771.35
  6. Step 6: Final answer
    x = 606.89

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1.5x scale

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.