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Finding the Fourth Proportional to 117.61, 176.29 and 66.25

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Solution

The fourth proportional to 117.61, 176.29 and 66.25 is: 99.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.61 : 176.29 = 66.25 : x
  2. Step 2: Convert to fraction form
    117.61/176.29 = 66.25/x
  3. Step 3: Cross multiply
    117.61x = 176.29 × 66.25
  4. Step 4: Simplify right side
    117.61x = 11,679.21
  5. Step 5: Solve for x
    x = 11,679.21/117.61
  6. Step 6: Final answer
    x = 99.30

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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.