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Finding the Fourth Proportional to 470.06, 648.91 and 312.96

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Solution

The fourth proportional to 470.06, 648.91 and 312.96 is: 432.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.06 : 648.91 = 312.96 : x
  2. Step 2: Convert to fraction form
    470.06/648.91 = 312.96/x
  3. Step 3: Cross multiply
    470.06x = 648.91 × 312.96
  4. Step 4: Simplify right side
    470.06x = 203,082.87
  5. Step 5: Solve for x
    x = 203,082.87/470.06
  6. Step 6: Final answer
    x = 432.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.