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Finding the Fourth Proportional to 626.44, 864.24 and 390.25

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Solution

The fourth proportional to 626.44, 864.24 and 390.25 is: 538.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.44 : 864.24 = 390.25 : x
  2. Step 2: Convert to fraction form
    626.44/864.24 = 390.25/x
  3. Step 3: Cross multiply
    626.44x = 864.24 × 390.25
  4. Step 4: Simplify right side
    626.44x = 337,269.66
  5. Step 5: Solve for x
    x = 337,269.66/626.44
  6. Step 6: Final answer
    x = 538.39

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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.