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Finding the Fourth Proportional to 471.99, 707.99 and 215.31

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Solution

The fourth proportional to 471.99, 707.99 and 215.31 is: 322.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.99 : 707.99 = 215.31 : x
  2. Step 2: Convert to fraction form
    471.99/707.99 = 215.31/x
  3. Step 3: Cross multiply
    471.99x = 707.99 × 215.31
  4. Step 4: Simplify right side
    471.99x = 152,437.33
  5. Step 5: Solve for x
    x = 152,437.33/471.99
  6. Step 6: Final answer
    x = 322.97

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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.