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Finding the Fourth Proportional to 251.64, 347.21 and 153.40

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Solution

The fourth proportional to 251.64, 347.21 and 153.40 is: 211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.64 : 347.21 = 153.40 : x
  2. Step 2: Convert to fraction form
    251.64/347.21 = 153.40/x
  3. Step 3: Cross multiply
    251.64x = 347.21 × 153.40
  4. Step 4: Simplify right side
    251.64x = 53,262.01
  5. Step 5: Solve for x
    x = 53,262.01/251.64
  6. Step 6: Final answer
    x = 211.66

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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.