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Finding the Fourth Proportional to 640.13, 882.94 and 618.70

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Solution

The fourth proportional to 640.13, 882.94 and 618.70 is: 853.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.13 : 882.94 = 618.70 : x
  2. Step 2: Convert to fraction form
    640.13/882.94 = 618.70/x
  3. Step 3: Cross multiply
    640.13x = 882.94 × 618.70
  4. Step 4: Simplify right side
    640.13x = 546,274.98
  5. Step 5: Solve for x
    x = 546,274.98/640.13
  6. Step 6: Final answer
    x = 853.38

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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.