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Finding the Fourth Proportional to 521.48, 719.61 and 285.41

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Solution

The fourth proportional to 521.48, 719.61 and 285.41 is: 393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.48 : 719.61 = 285.41 : x
  2. Step 2: Convert to fraction form
    521.48/719.61 = 285.41/x
  3. Step 3: Cross multiply
    521.48x = 719.61 × 285.41
  4. Step 4: Simplify right side
    521.48x = 205,383.89
  5. Step 5: Solve for x
    x = 205,383.89/521.48
  6. Step 6: Final answer
    x = 393.85

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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.