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Finding the Fourth Proportional to 639.66, 954.87 and 557.63

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Solution

The fourth proportional to 639.66, 954.87 and 557.63 is: 832.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.66 : 954.87 = 557.63 : x
  2. Step 2: Convert to fraction form
    639.66/954.87 = 557.63/x
  3. Step 3: Cross multiply
    639.66x = 954.87 × 557.63
  4. Step 4: Simplify right side
    639.66x = 532,459.38
  5. Step 5: Solve for x
    x = 532,459.38/639.66
  6. Step 6: Final answer
    x = 832.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.