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Finding the Fourth Proportional to 131.40, 181.41 and 103.59

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Solution

The fourth proportional to 131.40, 181.41 and 103.59 is: 143.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.40 : 181.41 = 103.59 : x
  2. Step 2: Convert to fraction form
    131.40/181.41 = 103.59/x
  3. Step 3: Cross multiply
    131.40x = 181.41 × 103.59
  4. Step 4: Simplify right side
    131.40x = 18,792.26
  5. Step 5: Solve for x
    x = 18,792.26/131.40
  6. Step 6: Final answer
    x = 143.02

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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.