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Finding the Fourth Proportional to 618.72, 854.38 and 422.70

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Solution

The fourth proportional to 618.72, 854.38 and 422.70 is: 583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.72 : 854.38 = 422.70 : x
  2. Step 2: Convert to fraction form
    618.72/854.38 = 422.70/x
  3. Step 3: Cross multiply
    618.72x = 854.38 × 422.70
  4. Step 4: Simplify right side
    618.72x = 361,146.43
  5. Step 5: Solve for x
    x = 361,146.43/618.72
  6. Step 6: Final answer
    x = 583.70

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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.