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Finding the Fourth Proportional to 291.80, 403.04 and 256.86

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Solution

The fourth proportional to 291.80, 403.04 and 256.86 is: 354.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.80 : 403.04 = 256.86 : x
  2. Step 2: Convert to fraction form
    291.80/403.04 = 256.86/x
  3. Step 3: Cross multiply
    291.80x = 403.04 × 256.86
  4. Step 4: Simplify right side
    291.80x = 103,525.50
  5. Step 5: Solve for x
    x = 103,525.50/291.80
  6. Step 6: Final answer
    x = 354.78

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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.