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Finding the Fourth Proportional to 313.39, 470.15 and 130.92

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Solution

The fourth proportional to 313.39, 470.15 and 130.92 is: 196.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.39 : 470.15 = 130.92 : x
  2. Step 2: Convert to fraction form
    313.39/470.15 = 130.92/x
  3. Step 3: Cross multiply
    313.39x = 470.15 × 130.92
  4. Step 4: Simplify right side
    313.39x = 61,549.74
  5. Step 5: Solve for x
    x = 61,549.74/313.39
  6. Step 6: Final answer
    x = 196.40

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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.