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Finding the Fourth Proportional to 661.94, 992.61 and 353.72

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Solution

The fourth proportional to 661.94, 992.61 and 353.72 is: 530.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.94 : 992.61 = 353.72 : x
  2. Step 2: Convert to fraction form
    661.94/992.61 = 353.72/x
  3. Step 3: Cross multiply
    661.94x = 992.61 × 353.72
  4. Step 4: Simplify right side
    661.94x = 351,103.53
  5. Step 5: Solve for x
    x = 351,103.53/661.94
  6. Step 6: Final answer
    x = 530.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.