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Finding the Fourth Proportional to 276.72, 417.22 and 258.16

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Solution

The fourth proportional to 276.72, 417.22 and 258.16 is: 389.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.72 : 417.22 = 258.16 : x
  2. Step 2: Convert to fraction form
    276.72/417.22 = 258.16/x
  3. Step 3: Cross multiply
    276.72x = 417.22 × 258.16
  4. Step 4: Simplify right side
    276.72x = 107,709.52
  5. Step 5: Solve for x
    x = 107,709.52/276.72
  6. Step 6: Final answer
    x = 389.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.