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Finding the Fourth Proportional to 145.56, 218.40 and 72.44

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Solution

The fourth proportional to 145.56, 218.40 and 72.44 is: 108.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.56 : 218.40 = 72.44 : x
  2. Step 2: Convert to fraction form
    145.56/218.40 = 72.44/x
  3. Step 3: Cross multiply
    145.56x = 218.40 × 72.44
  4. Step 4: Simplify right side
    145.56x = 15,820.90
  5. Step 5: Solve for x
    x = 15,820.90/145.56
  6. Step 6: Final answer
    x = 108.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.