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Finding the Fourth Proportional to 315.21, 434.89 and 190.83

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Solution

The fourth proportional to 315.21, 434.89 and 190.83 is: 263.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.21 : 434.89 = 190.83 : x
  2. Step 2: Convert to fraction form
    315.21/434.89 = 190.83/x
  3. Step 3: Cross multiply
    315.21x = 434.89 × 190.83
  4. Step 4: Simplify right side
    315.21x = 82,988.67
  5. Step 5: Solve for x
    x = 82,988.67/315.21
  6. Step 6: Final answer
    x = 263.28

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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.