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Finding the Fourth Proportional to 131.06, 180.86 and 72.05

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Solution

The fourth proportional to 131.06, 180.86 and 72.05 is: 99.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.06 : 180.86 = 72.05 : x
  2. Step 2: Convert to fraction form
    131.06/180.86 = 72.05/x
  3. Step 3: Cross multiply
    131.06x = 180.86 × 72.05
  4. Step 4: Simplify right side
    131.06x = 13,030.66
  5. Step 5: Solve for x
    x = 13,030.66/131.06
  6. Step 6: Final answer
    x = 99.43

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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.