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Finding the Fourth Proportional to 379.79, 524.10 and 213.99

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Solution

The fourth proportional to 379.79, 524.10 and 213.99 is: 295.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.79 : 524.10 = 213.99 : x
  2. Step 2: Convert to fraction form
    379.79/524.10 = 213.99/x
  3. Step 3: Cross multiply
    379.79x = 524.10 × 213.99
  4. Step 4: Simplify right side
    379.79x = 112,152.16
  5. Step 5: Solve for x
    x = 112,152.16/379.79
  6. Step 6: Final answer
    x = 295.30

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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.