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Finding the Fourth Proportional to 771.38, 1,064.35 and 439.72

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Solution

The fourth proportional to 771.38, 1,064.35 and 439.72 is: 606.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.38 : 1,064.35 = 439.72 : x
  2. Step 2: Convert to fraction form
    771.38/1,064.35 = 439.72/x
  3. Step 3: Cross multiply
    771.38x = 1,064.35 × 439.72
  4. Step 4: Simplify right side
    771.38x = 468,015.98
  5. Step 5: Solve for x
    x = 468,015.98/771.38
  6. Step 6: Final answer
    x = 606.73

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Double scale
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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.