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Finding the Fourth Proportional to 479.40, 661.36 and 292.74

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Solution

The fourth proportional to 479.40, 661.36 and 292.74 is: 403.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.40 : 661.36 = 292.74 : x
  2. Step 2: Convert to fraction form
    479.40/661.36 = 292.74/x
  3. Step 3: Cross multiply
    479.40x = 661.36 × 292.74
  4. Step 4: Simplify right side
    479.40x = 193,606.53
  5. Step 5: Solve for x
    x = 193,606.53/479.40
  6. Step 6: Final answer
    x = 403.85

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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.