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Finding the Fourth Proportional to 131.66, 181.77 and 90.20

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Solution

The fourth proportional to 131.66, 181.77 and 90.20 is: 124.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.66 : 181.77 = 90.20 : x
  2. Step 2: Convert to fraction form
    131.66/181.77 = 90.20/x
  3. Step 3: Cross multiply
    131.66x = 181.77 × 90.20
  4. Step 4: Simplify right side
    131.66x = 16,395.65
  5. Step 5: Solve for x
    x = 16,395.65/131.66
  6. Step 6: Final answer
    x = 124.53

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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.