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Finding the Fourth Proportional to 275.08, 378.98 and 257.16

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Solution

The fourth proportional to 275.08, 378.98 and 257.16 is: 354.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.08 : 378.98 = 257.16 : x
  2. Step 2: Convert to fraction form
    275.08/378.98 = 257.16/x
  3. Step 3: Cross multiply
    275.08x = 378.98 × 257.16
  4. Step 4: Simplify right side
    275.08x = 97,458.50
  5. Step 5: Solve for x
    x = 97,458.50/275.08
  6. Step 6: Final answer
    x = 354.29

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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.