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Finding the Fourth Proportional to 131.55, 181.61 and 84.99

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Solution

The fourth proportional to 131.55, 181.61 and 84.99 is: 117.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.55 : 181.61 = 84.99 : x
  2. Step 2: Convert to fraction form
    131.55/181.61 = 84.99/x
  3. Step 3: Cross multiply
    131.55x = 181.61 × 84.99
  4. Step 4: Simplify right side
    131.55x = 15,434.61
  5. Step 5: Solve for x
    x = 15,434.61/131.55
  6. Step 6: Final answer
    x = 117.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.