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Finding the Fourth Proportional to 640.15, 882.59 and 415.69

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Solution

The fourth proportional to 640.15, 882.59 and 415.69 is: 573.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.15 : 882.59 = 415.69 : x
  2. Step 2: Convert to fraction form
    640.15/882.59 = 415.69/x
  3. Step 3: Cross multiply
    640.15x = 882.59 × 415.69
  4. Step 4: Simplify right side
    640.15x = 366,879.55
  5. Step 5: Solve for x
    x = 366,879.55/640.15
  6. Step 6: Final answer
    x = 573.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.