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Finding the Fourth Proportional to 661.75, 992.30 and 314.87

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Solution

The fourth proportional to 661.75, 992.30 and 314.87 is: 472.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.75 : 992.30 = 314.87 : x
  2. Step 2: Convert to fraction form
    661.75/992.30 = 314.87/x
  3. Step 3: Cross multiply
    661.75x = 992.30 × 314.87
  4. Step 4: Simplify right side
    661.75x = 312,445.50
  5. Step 5: Solve for x
    x = 312,445.50/661.75
  6. Step 6: Final answer
    x = 472.15

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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.