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Finding the Fourth Proportional to 639.62, 882.90 and 619.10

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Solution

The fourth proportional to 639.62, 882.90 and 619.10 is: 854.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.62 : 882.90 = 619.10 : x
  2. Step 2: Convert to fraction form
    639.62/882.90 = 619.10/x
  3. Step 3: Cross multiply
    639.62x = 882.90 × 619.10
  4. Step 4: Simplify right side
    639.62x = 546,603.39
  5. Step 5: Solve for x
    x = 546,603.39/639.62
  6. Step 6: Final answer
    x = 854.58

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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.