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Finding the Fourth Proportional to 312.56, 471.26 and 291.68

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Solution

The fourth proportional to 312.56, 471.26 and 291.68 is: 439.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.56 : 471.26 = 291.68 : x
  2. Step 2: Convert to fraction form
    312.56/471.26 = 291.68/x
  3. Step 3: Cross multiply
    312.56x = 471.26 × 291.68
  4. Step 4: Simplify right side
    312.56x = 137,457.12
  5. Step 5: Solve for x
    x = 137,457.12/312.56
  6. Step 6: Final answer
    x = 439.78

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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.