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Finding the Fourth Proportional to 611.78, 844.19 and 346.25

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Solution

The fourth proportional to 611.78, 844.19 and 346.25 is: 477.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.78 : 844.19 = 346.25 : x
  2. Step 2: Convert to fraction form
    611.78/844.19 = 346.25/x
  3. Step 3: Cross multiply
    611.78x = 844.19 × 346.25
  4. Step 4: Simplify right side
    611.78x = 292,297.72
  5. Step 5: Solve for x
    x = 292,297.72/611.78
  6. Step 6: Final answer
    x = 477.79

Related Problems

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Half scale
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Double scale
Find fourth proportional to 612.78, 845.57 and 347.25
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.