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Finding the Fourth Proportional to 251.76, 347.31 and 215.31

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Solution

The fourth proportional to 251.76, 347.31 and 215.31 is: 297.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.76 : 347.31 = 215.31 : x
  2. Step 2: Convert to fraction form
    251.76/347.31 = 215.31/x
  3. Step 3: Cross multiply
    251.76x = 347.31 × 215.31
  4. Step 4: Simplify right side
    251.76x = 74,779.32
  5. Step 5: Solve for x
    x = 74,779.32/251.76
  6. Step 6: Final answer
    x = 297.03

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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.