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Finding the Fourth Proportional to 618.92, 853.86 and 461.28

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Solution

The fourth proportional to 618.92, 853.86 and 461.28 is: 636.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.92 : 853.86 = 461.28 : x
  2. Step 2: Convert to fraction form
    618.92/853.86 = 461.28/x
  3. Step 3: Cross multiply
    618.92x = 853.86 × 461.28
  4. Step 4: Simplify right side
    618.92x = 393,868.54
  5. Step 5: Solve for x
    x = 393,868.54/618.92
  6. Step 6: Final answer
    x = 636.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 619.92, 855.24 and 462.28
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.