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Finding the Fourth Proportional to 291.32, 436.62 and 258.76

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Solution

The fourth proportional to 291.32, 436.62 and 258.76 is: 387.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.32 : 436.62 = 258.76 : x
  2. Step 2: Convert to fraction form
    291.32/436.62 = 258.76/x
  3. Step 3: Cross multiply
    291.32x = 436.62 × 258.76
  4. Step 4: Simplify right side
    291.32x = 112,979.79
  5. Step 5: Solve for x
    x = 112,979.79/291.32
  6. Step 6: Final answer
    x = 387.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.