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Finding the Fourth Proportional to 248.51, 342.90 and 155.18

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Solution

The fourth proportional to 248.51, 342.90 and 155.18 is: 214.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.51 : 342.90 = 155.18 : x
  2. Step 2: Convert to fraction form
    248.51/342.90 = 155.18/x
  3. Step 3: Cross multiply
    248.51x = 342.90 × 155.18
  4. Step 4: Simplify right side
    248.51x = 53,211.22
  5. Step 5: Solve for x
    x = 53,211.22/248.51
  6. Step 6: Final answer
    x = 214.12

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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.