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Finding the Fourth Proportional to 479.61, 661.94 and 283.11

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Solution

The fourth proportional to 479.61, 661.94 and 283.11 is: 390.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.61 : 661.94 = 283.11 : x
  2. Step 2: Convert to fraction form
    479.61/661.94 = 283.11/x
  3. Step 3: Cross multiply
    479.61x = 661.94 × 283.11
  4. Step 4: Simplify right side
    479.61x = 187,400.42
  5. Step 5: Solve for x
    x = 187,400.42/479.61
  6. Step 6: Final answer
    x = 390.74

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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.