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Finding the Fourth Proportional to 153.88, 212.55 and 125.12

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Solution

The fourth proportional to 153.88, 212.55 and 125.12 is: 172.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.88 : 212.55 = 125.12 : x
  2. Step 2: Convert to fraction form
    153.88/212.55 = 125.12/x
  3. Step 3: Cross multiply
    153.88x = 212.55 × 125.12
  4. Step 4: Simplify right side
    153.88x = 26,594.26
  5. Step 5: Solve for x
    x = 26,594.26/153.88
  6. Step 6: Final answer
    x = 172.82

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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.