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Finding the Fourth Proportional to 251.56, 347.20 and 153.30

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Solution

The fourth proportional to 251.56, 347.20 and 153.30 is: 211.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.56 : 347.20 = 153.30 : x
  2. Step 2: Convert to fraction form
    251.56/347.20 = 153.30/x
  3. Step 3: Cross multiply
    251.56x = 347.20 × 153.30
  4. Step 4: Simplify right side
    251.56x = 53,225.76
  5. Step 5: Solve for x
    x = 53,225.76/251.56
  6. Step 6: Final answer
    x = 211.58

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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.