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Finding the Fourth Proportional to 470.31, 704.94 and 287.31

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Solution

The fourth proportional to 470.31, 704.94 and 287.31 is: 430.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.31 : 704.94 = 287.31 : x
  2. Step 2: Convert to fraction form
    470.31/704.94 = 287.31/x
  3. Step 3: Cross multiply
    470.31x = 704.94 × 287.31
  4. Step 4: Simplify right side
    470.31x = 202,536.31
  5. Step 5: Solve for x
    x = 202,536.31/470.31
  6. Step 6: Final answer
    x = 430.64

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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.