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Finding the Fourth Proportional to 313.48, 470.28 and 130.78

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Solution

The fourth proportional to 313.48, 470.28 and 130.78 is: 196.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.48 : 470.28 = 130.78 : x
  2. Step 2: Convert to fraction form
    313.48/470.28 = 130.78/x
  3. Step 3: Cross multiply
    313.48x = 470.28 × 130.78
  4. Step 4: Simplify right side
    313.48x = 61,500.87
  5. Step 5: Solve for x
    x = 61,500.87/313.48
  6. Step 6: Final answer
    x = 196.19

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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.