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Finding the Fourth Proportional to 313.40, 470.09 and 128.35

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Solution

The fourth proportional to 313.40, 470.09 and 128.35 is: 192.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.40 : 470.09 = 128.35 : x
  2. Step 2: Convert to fraction form
    313.40/470.09 = 128.35/x
  3. Step 3: Cross multiply
    313.40x = 470.09 × 128.35
  4. Step 4: Simplify right side
    313.40x = 60,336.96
  5. Step 5: Solve for x
    x = 60,336.96/313.40
  6. Step 6: Final answer
    x = 192.52

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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.