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Finding the Fourth Proportional to 419.68, 579.30 and 286.98

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Solution

The fourth proportional to 419.68, 579.30 and 286.98 is: 396.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.68 : 579.30 = 286.98 : x
  2. Step 2: Convert to fraction form
    419.68/579.30 = 286.98/x
  3. Step 3: Cross multiply
    419.68x = 579.30 × 286.98
  4. Step 4: Simplify right side
    419.68x = 166,247.51
  5. Step 5: Solve for x
    x = 166,247.51/419.68
  6. Step 6: Final answer
    x = 396.13

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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.