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Finding the Fourth Proportional to 153.95, 212.67 and 107.45

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Solution

The fourth proportional to 153.95, 212.67 and 107.45 is: 148.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.95 : 212.67 = 107.45 : x
  2. Step 2: Convert to fraction form
    153.95/212.67 = 107.45/x
  3. Step 3: Cross multiply
    153.95x = 212.67 × 107.45
  4. Step 4: Simplify right side
    153.95x = 22,851.39
  5. Step 5: Solve for x
    x = 22,851.39/153.95
  6. Step 6: Final answer
    x = 148.43

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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.