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Finding the Fourth Proportional to 607.21, 910.82 and 319.21

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Solution

The fourth proportional to 607.21, 910.82 and 319.21 is: 478.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.21 : 910.82 = 319.21 : x
  2. Step 2: Convert to fraction form
    607.21/910.82 = 319.21/x
  3. Step 3: Cross multiply
    607.21x = 910.82 × 319.21
  4. Step 4: Simplify right side
    607.21x = 290,742.85
  5. Step 5: Solve for x
    x = 290,742.85/607.21
  6. Step 6: Final answer
    x = 478.82

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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.