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Finding the Fourth Proportional to 611.49, 844.47 and 390.54

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Solution

The fourth proportional to 611.49, 844.47 and 390.54 is: 539.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.49 : 844.47 = 390.54 : x
  2. Step 2: Convert to fraction form
    611.49/844.47 = 390.54/x
  3. Step 3: Cross multiply
    611.49x = 844.47 × 390.54
  4. Step 4: Simplify right side
    611.49x = 329,799.31
  5. Step 5: Solve for x
    x = 329,799.31/611.49
  6. Step 6: Final answer
    x = 539.34

Related Problems

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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.