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Finding the Fourth Proportional to 619.21, 929.15 and 253.96

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Solution

The fourth proportional to 619.21, 929.15 and 253.96 is: 381.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.21 : 929.15 = 253.96 : x
  2. Step 2: Convert to fraction form
    619.21/929.15 = 253.96/x
  3. Step 3: Cross multiply
    619.21x = 929.15 × 253.96
  4. Step 4: Simplify right side
    619.21x = 235,966.93
  5. Step 5: Solve for x
    x = 235,966.93/619.21
  6. Step 6: Final answer
    x = 381.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.