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Finding the Fourth Proportional to 618.76, 853.77 and 422.20

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Solution

The fourth proportional to 618.76, 853.77 and 422.20 is: 582.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.76 : 853.77 = 422.20 : x
  2. Step 2: Convert to fraction form
    618.76/853.77 = 422.20/x
  3. Step 3: Cross multiply
    618.76x = 853.77 × 422.20
  4. Step 4: Simplify right side
    618.76x = 360,461.69
  5. Step 5: Solve for x
    x = 360,461.69/618.76
  6. Step 6: Final answer
    x = 582.55

Related Problems

Find fourth proportional to 309.38, 426.89 and 211.10
Half scale
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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.