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Finding the Fourth Proportional to 415.63, 623.40 and 210.09

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Solution

The fourth proportional to 415.63, 623.40 and 210.09 is: 315.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.63 : 623.40 = 210.09 : x
  2. Step 2: Convert to fraction form
    415.63/623.40 = 210.09/x
  3. Step 3: Cross multiply
    415.63x = 623.40 × 210.09
  4. Step 4: Simplify right side
    415.63x = 130,971.66
  5. Step 5: Solve for x
    x = 130,971.66/415.63
  6. Step 6: Final answer
    x = 315.12

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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.