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Finding the Fourth Proportional to 131.18, 180.74 and 89.72

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Solution

The fourth proportional to 131.18, 180.74 and 89.72 is: 123.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.18 : 180.74 = 89.72 : x
  2. Step 2: Convert to fraction form
    131.18/180.74 = 89.72/x
  3. Step 3: Cross multiply
    131.18x = 180.74 × 89.72
  4. Step 4: Simplify right side
    131.18x = 16,215.99
  5. Step 5: Solve for x
    x = 16,215.99/131.18
  6. Step 6: Final answer
    x = 123.62

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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.