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Finding the Fourth Proportional to 153.76, 212.16 and 91.60

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Solution

The fourth proportional to 153.76, 212.16 and 91.60 is: 126.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.76 : 212.16 = 91.60 : x
  2. Step 2: Convert to fraction form
    153.76/212.16 = 91.60/x
  3. Step 3: Cross multiply
    153.76x = 212.16 × 91.60
  4. Step 4: Simplify right side
    153.76x = 19,433.86
  5. Step 5: Solve for x
    x = 19,433.86/153.76
  6. Step 6: Final answer
    x = 126.39

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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.