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Finding the Fourth Proportional to 415.29, 621.50 and 259.05

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Solution

The fourth proportional to 415.29, 621.50 and 259.05 is: 387.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.29 : 621.50 = 259.05 : x
  2. Step 2: Convert to fraction form
    415.29/621.50 = 259.05/x
  3. Step 3: Cross multiply
    415.29x = 621.50 × 259.05
  4. Step 4: Simplify right side
    415.29x = 160,999.58
  5. Step 5: Solve for x
    x = 160,999.58/415.29
  6. Step 6: Final answer
    x = 387.68

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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.