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Finding the Fourth Proportional to 470.20, 647.58 and 427

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Solution

The fourth proportional to 470.20, 647.58 and 427 is: 588.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.20 : 647.58 = 427 : x
  2. Step 2: Convert to fraction form
    470.20/647.58 = 427/x
  3. Step 3: Cross multiply
    470.20x = 647.58 × 427
  4. Step 4: Simplify right side
    470.20x = 276,516.66
  5. Step 5: Solve for x
    x = 276,516.66/470.20
  6. Step 6: Final answer
    x = 588.08

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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.