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Finding the Fourth Proportional to 415.08, 623.20 and 253.08

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Solution

The fourth proportional to 415.08, 623.20 and 253.08 is: 379.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.08 : 623.20 = 253.08 : x
  2. Step 2: Convert to fraction form
    415.08/623.20 = 253.08/x
  3. Step 3: Cross multiply
    415.08x = 623.20 × 253.08
  4. Step 4: Simplify right side
    415.08x = 157,719.46
  5. Step 5: Solve for x
    x = 157,719.46/415.08
  6. Step 6: Final answer
    x = 379.97

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Double scale
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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.