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Finding the Fourth Proportional to 415.78, 623.30 and 210.06

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Solution

The fourth proportional to 415.78, 623.30 and 210.06 is: 314.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.78 : 623.30 = 210.06 : x
  2. Step 2: Convert to fraction form
    415.78/623.30 = 210.06/x
  3. Step 3: Cross multiply
    415.78x = 623.30 × 210.06
  4. Step 4: Simplify right side
    415.78x = 130,930.40
  5. Step 5: Solve for x
    x = 130,930.40/415.78
  6. Step 6: Final answer
    x = 314.90

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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.