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Finding the Fourth Proportional to 640.30, 883.59 and 360.55

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Solution

The fourth proportional to 640.30, 883.59 and 360.55 is: 497.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.30 : 883.59 = 360.55 : x
  2. Step 2: Convert to fraction form
    640.30/883.59 = 360.55/x
  3. Step 3: Cross multiply
    640.30x = 883.59 × 360.55
  4. Step 4: Simplify right side
    640.30x = 318,573.96
  5. Step 5: Solve for x
    x = 318,573.96/640.30
  6. Step 6: Final answer
    x = 497.54

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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.