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Finding the Fourth Proportional to 415.40, 623.10 and 380.30

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Solution

The fourth proportional to 415.40, 623.10 and 380.30 is: 570.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.40 : 623.10 = 380.30 : x
  2. Step 2: Convert to fraction form
    415.40/623.10 = 380.30/x
  3. Step 3: Cross multiply
    415.40x = 623.10 × 380.30
  4. Step 4: Simplify right side
    415.40x = 236,964.93
  5. Step 5: Solve for x
    x = 236,964.93/415.40
  6. Step 6: Final answer
    x = 570.45

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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.