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Finding the Fourth Proportional to 291.91, 438.10 and 257.74

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Solution

The fourth proportional to 291.91, 438.10 and 257.74 is: 386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.91 : 438.10 = 257.74 : x
  2. Step 2: Convert to fraction form
    291.91/438.10 = 257.74/x
  3. Step 3: Cross multiply
    291.91x = 438.10 × 257.74
  4. Step 4: Simplify right side
    291.91x = 112,915.89
  5. Step 5: Solve for x
    x = 112,915.89/291.91
  6. Step 6: Final answer
    x = 386.82

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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.