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Finding the Fourth Proportional to 153.66, 212.02 and 107.08

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Solution

The fourth proportional to 153.66, 212.02 and 107.08 is: 147.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.66 : 212.02 = 107.08 : x
  2. Step 2: Convert to fraction form
    153.66/212.02 = 107.08/x
  3. Step 3: Cross multiply
    153.66x = 212.02 × 107.08
  4. Step 4: Simplify right side
    153.66x = 22,703.10
  5. Step 5: Solve for x
    x = 22,703.10/153.66
  6. Step 6: Final answer
    x = 147.75

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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.