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Finding the Fourth Proportional to 507.84, 699.84 and 391.04

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Solution

The fourth proportional to 507.84, 699.84 and 391.04 is: 538.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.84 : 699.84 = 391.04 : x
  2. Step 2: Convert to fraction form
    507.84/699.84 = 391.04/x
  3. Step 3: Cross multiply
    507.84x = 699.84 × 391.04
  4. Step 4: Simplify right side
    507.84x = 273,665.43
  5. Step 5: Solve for x
    x = 273,665.43/507.84
  6. Step 6: Final answer
    x = 538.88

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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.