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Finding the Fourth Proportional to 313.56, 471.24 and 259.80

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Solution

The fourth proportional to 313.56, 471.24 and 259.80 is: 390.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.56 : 471.24 = 259.80 : x
  2. Step 2: Convert to fraction form
    313.56/471.24 = 259.80/x
  3. Step 3: Cross multiply
    313.56x = 471.24 × 259.80
  4. Step 4: Simplify right side
    313.56x = 122,428.15
  5. Step 5: Solve for x
    x = 122,428.15/313.56
  6. Step 6: Final answer
    x = 390.45

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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.