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Finding the Fourth Proportional to 661.09, 991.56 and 174.18

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Solution

The fourth proportional to 661.09, 991.56 and 174.18 is: 261.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.09 : 991.56 = 174.18 : x
  2. Step 2: Convert to fraction form
    661.09/991.56 = 174.18/x
  3. Step 3: Cross multiply
    661.09x = 991.56 × 174.18
  4. Step 4: Simplify right side
    661.09x = 172,706.57
  5. Step 5: Solve for x
    x = 172,706.57/661.09
  6. Step 6: Final answer
    x = 261.25

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1.5x scale

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.