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Finding the Fourth Proportional to 640.07, 883.10 and 391.12

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Solution

The fourth proportional to 640.07, 883.10 and 391.12 is: 539.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.07 : 883.10 = 391.12 : x
  2. Step 2: Convert to fraction form
    640.07/883.10 = 391.12/x
  3. Step 3: Cross multiply
    640.07x = 883.10 × 391.12
  4. Step 4: Simplify right side
    640.07x = 345,397.22
  5. Step 5: Solve for x
    x = 345,397.22/640.07
  6. Step 6: Final answer
    x = 539.63

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