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Finding the Fourth Proportional to 479.28, 661.47 and 282.87

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Solution

The fourth proportional to 479.28, 661.47 and 282.87 is: 390.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.28 : 661.47 = 282.87 : x
  2. Step 2: Convert to fraction form
    479.28/661.47 = 282.87/x
  3. Step 3: Cross multiply
    479.28x = 661.47 × 282.87
  4. Step 4: Simplify right side
    479.28x = 187,110.02
  5. Step 5: Solve for x
    x = 187,110.02/479.28
  6. Step 6: Final answer
    x = 390.40

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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.