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Finding the Fourth Proportional to 153.90, 212.42 and 101.45

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Solution

The fourth proportional to 153.90, 212.42 and 101.45 is: 140.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.90 : 212.42 = 101.45 : x
  2. Step 2: Convert to fraction form
    153.90/212.42 = 101.45/x
  3. Step 3: Cross multiply
    153.90x = 212.42 × 101.45
  4. Step 4: Simplify right side
    153.90x = 21,550.79
  5. Step 5: Solve for x
    x = 21,550.79/153.90
  6. Step 6: Final answer
    x = 140.03

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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.