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Finding the Fourth Proportional to 153.64, 212.46 and 129.40

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Solution

The fourth proportional to 153.64, 212.46 and 129.40 is: 178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.64 : 212.46 = 129.40 : x
  2. Step 2: Convert to fraction form
    153.64/212.46 = 129.40/x
  3. Step 3: Cross multiply
    153.64x = 212.46 × 129.40
  4. Step 4: Simplify right side
    153.64x = 27,492.32
  5. Step 5: Solve for x
    x = 27,492.32/153.64
  6. Step 6: Final answer
    x = 178.94

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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.