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Finding the Fourth Proportional to 479.40, 661.70 and 282.96

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Solution

The fourth proportional to 479.40, 661.70 and 282.96 is: 390.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.40 : 661.70 = 282.96 : x
  2. Step 2: Convert to fraction form
    479.40/661.70 = 282.96/x
  3. Step 3: Cross multiply
    479.40x = 661.70 × 282.96
  4. Step 4: Simplify right side
    479.40x = 187,234.63
  5. Step 5: Solve for x
    x = 187,234.63/479.40
  6. Step 6: Final answer
    x = 390.56

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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.