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Finding the Fourth Proportional to 315.21, 434.97 and 190.88

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Solution

The fourth proportional to 315.21, 434.97 and 190.88 is: 263.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.21 : 434.97 = 190.88 : x
  2. Step 2: Convert to fraction form
    315.21/434.97 = 190.88/x
  3. Step 3: Cross multiply
    315.21x = 434.97 × 190.88
  4. Step 4: Simplify right side
    315.21x = 83,024.90
  5. Step 5: Solve for x
    x = 83,024.90/315.21
  6. Step 6: Final answer
    x = 263.40

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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.