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Finding the Fourth Proportional to 312.92, 470.36 and 290.32

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Solution

The fourth proportional to 312.92, 470.36 and 290.32 is: 436.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.92 : 470.36 = 290.32 : x
  2. Step 2: Convert to fraction form
    312.92/470.36 = 290.32/x
  3. Step 3: Cross multiply
    312.92x = 470.36 × 290.32
  4. Step 4: Simplify right side
    312.92x = 136,554.92
  5. Step 5: Solve for x
    x = 136,554.92/312.92
  6. Step 6: Final answer
    x = 436.39

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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.