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Finding the Fourth Proportional to 612.82, 919.23 and 431.03

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Solution

The fourth proportional to 612.82, 919.23 and 431.03 is: 646.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.82 : 919.23 = 431.03 : x
  2. Step 2: Convert to fraction form
    612.82/919.23 = 431.03/x
  3. Step 3: Cross multiply
    612.82x = 919.23 × 431.03
  4. Step 4: Simplify right side
    612.82x = 396,215.71
  5. Step 5: Solve for x
    x = 396,215.71/612.82
  6. Step 6: Final answer
    x = 646.55

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Double scale
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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.