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Finding the Fourth Proportional to 639.77, 882.86 and 356.18

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Solution

The fourth proportional to 639.77, 882.86 and 356.18 is: 491.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.77 : 882.86 = 356.18 : x
  2. Step 2: Convert to fraction form
    639.77/882.86 = 356.18/x
  3. Step 3: Cross multiply
    639.77x = 882.86 × 356.18
  4. Step 4: Simplify right side
    639.77x = 314,457.07
  5. Step 5: Solve for x
    x = 314,457.07/639.77
  6. Step 6: Final answer
    x = 491.52

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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.