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Finding the Fourth Proportional to 684.38, 944.76 and 422.55

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Solution

The fourth proportional to 684.38, 944.76 and 422.55 is: 583.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.38 : 944.76 = 422.55 : x
  2. Step 2: Convert to fraction form
    684.38/944.76 = 422.55/x
  3. Step 3: Cross multiply
    684.38x = 944.76 × 422.55
  4. Step 4: Simplify right side
    684.38x = 399,208.34
  5. Step 5: Solve for x
    x = 399,208.34/684.38
  6. Step 6: Final answer
    x = 583.32

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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.