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Finding the Fourth Proportional to 153.72, 212.21 and 107.01

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Solution

The fourth proportional to 153.72, 212.21 and 107.01 is: 147.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.72 : 212.21 = 107.01 : x
  2. Step 2: Convert to fraction form
    153.72/212.21 = 107.01/x
  3. Step 3: Cross multiply
    153.72x = 212.21 × 107.01
  4. Step 4: Simplify right side
    153.72x = 22,708.06
  5. Step 5: Solve for x
    x = 22,708.06/153.72
  6. Step 6: Final answer
    x = 147.72

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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.