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Finding the Fourth Proportional to 131.16, 180.94 and 89.64

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Solution

The fourth proportional to 131.16, 180.94 and 89.64 is: 123.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.16 : 180.94 = 89.64 : x
  2. Step 2: Convert to fraction form
    131.16/180.94 = 89.64/x
  3. Step 3: Cross multiply
    131.16x = 180.94 × 89.64
  4. Step 4: Simplify right side
    131.16x = 16,219.46
  5. Step 5: Solve for x
    x = 16,219.46/131.16
  6. Step 6: Final answer
    x = 123.66

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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.