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Finding the Fourth Proportional to 661.12, 997.60 and 634.48

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Solution

The fourth proportional to 661.12, 997.60 and 634.48 is: 957.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.12 : 997.60 = 634.48 : x
  2. Step 2: Convert to fraction form
    661.12/997.60 = 634.48/x
  3. Step 3: Cross multiply
    661.12x = 997.60 × 634.48
  4. Step 4: Simplify right side
    661.12x = 632,957.25
  5. Step 5: Solve for x
    x = 632,957.25/661.12
  6. Step 6: Final answer
    x = 957.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.