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Finding the Fourth Proportional to 248.40, 342.60 and 215.52

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Solution

The fourth proportional to 248.40, 342.60 and 215.52 is: 297.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.40 : 342.60 = 215.52 : x
  2. Step 2: Convert to fraction form
    248.40/342.60 = 215.52/x
  3. Step 3: Cross multiply
    248.40x = 342.60 × 215.52
  4. Step 4: Simplify right side
    248.40x = 73,837.15
  5. Step 5: Solve for x
    x = 73,837.15/248.40
  6. Step 6: Final answer
    x = 297.25

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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.