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Finding the Fourth Proportional to 288.15, 433.79 and 258.38

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Solution

The fourth proportional to 288.15, 433.79 and 258.38 is: 388.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.15 : 433.79 = 258.38 : x
  2. Step 2: Convert to fraction form
    288.15/433.79 = 258.38/x
  3. Step 3: Cross multiply
    288.15x = 433.79 × 258.38
  4. Step 4: Simplify right side
    288.15x = 112,079.20
  5. Step 5: Solve for x
    x = 112,079.20/288.15
  6. Step 6: Final answer
    x = 388.96

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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.