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Finding the Fourth Proportional to 470.64, 647.90 and 447.54

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Solution

The fourth proportional to 470.64, 647.90 and 447.54 is: 616.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.64 : 647.90 = 447.54 : x
  2. Step 2: Convert to fraction form
    470.64/647.90 = 447.54/x
  3. Step 3: Cross multiply
    470.64x = 647.90 × 447.54
  4. Step 4: Simplify right side
    470.64x = 289,961.17
  5. Step 5: Solve for x
    x = 289,961.17/470.64
  6. Step 6: Final answer
    x = 616.10

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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.