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Finding the Fourth Proportional to 147.72, 221.63 and 45.01

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Solution

The fourth proportional to 147.72, 221.63 and 45.01 is: 67.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.72 : 221.63 = 45.01 : x
  2. Step 2: Convert to fraction form
    147.72/221.63 = 45.01/x
  3. Step 3: Cross multiply
    147.72x = 221.63 × 45.01
  4. Step 4: Simplify right side
    147.72x = 9,975.62
  5. Step 5: Solve for x
    x = 9,975.62/147.72
  6. Step 6: Final answer
    x = 67.53

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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.