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Finding the Fourth Proportional to 470.44, 647.89 and 378.91

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Solution

The fourth proportional to 470.44, 647.89 and 378.91 is: 521.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.44 : 647.89 = 378.91 : x
  2. Step 2: Convert to fraction form
    470.44/647.89 = 378.91/x
  3. Step 3: Cross multiply
    470.44x = 647.89 × 378.91
  4. Step 4: Simplify right side
    470.44x = 245,492.00
  5. Step 5: Solve for x
    x = 245,492.00/470.44
  6. Step 6: Final answer
    x = 521.83

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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.