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Finding the Fourth Proportional to 520.38, 718.74 and 422.64

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Solution

The fourth proportional to 520.38, 718.74 and 422.64 is: 583.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.38 : 718.74 = 422.64 : x
  2. Step 2: Convert to fraction form
    520.38/718.74 = 422.64/x
  3. Step 3: Cross multiply
    520.38x = 718.74 × 422.64
  4. Step 4: Simplify right side
    520.38x = 303,768.27
  5. Step 5: Solve for x
    x = 303,768.27/520.38
  6. Step 6: Final answer
    x = 583.74

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Double scale
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Similar ratio
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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.