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Finding the Fourth Proportional to 145.60, 218.24 and 72.56

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Solution

The fourth proportional to 145.60, 218.24 and 72.56 is: 108.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.60 : 218.24 = 72.56 : x
  2. Step 2: Convert to fraction form
    145.60/218.24 = 72.56/x
  3. Step 3: Cross multiply
    145.60x = 218.24 × 72.56
  4. Step 4: Simplify right side
    145.60x = 15,835.49
  5. Step 5: Solve for x
    x = 15,835.49/145.60
  6. Step 6: Final answer
    x = 108.76

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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.