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Finding the Fourth Proportional to 131.42, 181.34 and 72.40

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Solution

The fourth proportional to 131.42, 181.34 and 72.40 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.42 : 181.34 = 72.40 : x
  2. Step 2: Convert to fraction form
    131.42/181.34 = 72.40/x
  3. Step 3: Cross multiply
    131.42x = 181.34 × 72.40
  4. Step 4: Simplify right side
    131.42x = 13,129.02
  5. Step 5: Solve for x
    x = 13,129.02/131.42
  6. Step 6: Final answer
    x = 99.90

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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.