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Finding the Fourth Proportional to 554.49, 830.82 and 391.88

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Solution

The fourth proportional to 554.49, 830.82 and 391.88 is: 587.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.49 : 830.82 = 391.88 : x
  2. Step 2: Convert to fraction form
    554.49/830.82 = 391.88/x
  3. Step 3: Cross multiply
    554.49x = 830.82 × 391.88
  4. Step 4: Simplify right side
    554.49x = 325,581.74
  5. Step 5: Solve for x
    x = 325,581.74/554.49
  6. Step 6: Final answer
    x = 587.17

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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.