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Finding the Fourth Proportional to 640.21, 883.49 and 360.42

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Solution

The fourth proportional to 640.21, 883.49 and 360.42 is: 497.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.21 : 883.49 = 360.42 : x
  2. Step 2: Convert to fraction form
    640.21/883.49 = 360.42/x
  3. Step 3: Cross multiply
    640.21x = 883.49 × 360.42
  4. Step 4: Simplify right side
    640.21x = 318,427.76
  5. Step 5: Solve for x
    x = 318,427.76/640.21
  6. Step 6: Final answer
    x = 497.38

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1.5x scale

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.