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Finding the Fourth Proportional to 664.60, 988.79 and 651.64

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Solution

The fourth proportional to 664.60, 988.79 and 651.64 is: 969.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.60 : 988.79 = 651.64 : x
  2. Step 2: Convert to fraction form
    664.60/988.79 = 651.64/x
  3. Step 3: Cross multiply
    664.60x = 988.79 × 651.64
  4. Step 4: Simplify right side
    664.60x = 644,335.12
  5. Step 5: Solve for x
    x = 644,335.12/664.60
  6. Step 6: Final answer
    x = 969.51

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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.