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Finding the Fourth Proportional to 313.47, 470.21 and 128.37

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Solution

The fourth proportional to 313.47, 470.21 and 128.37 is: 192.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.47 : 470.21 = 128.37 : x
  2. Step 2: Convert to fraction form
    313.47/470.21 = 128.37/x
  3. Step 3: Cross multiply
    313.47x = 470.21 × 128.37
  4. Step 4: Simplify right side
    313.47x = 60,360.22
  5. Step 5: Solve for x
    x = 60,360.22/313.47
  6. Step 6: Final answer
    x = 192.56

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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.