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Finding the Fourth Proportional to 210.80, 315.90 and 174.47

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Solution

The fourth proportional to 210.80, 315.90 and 174.47 is: 261.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.80 : 315.90 = 174.47 : x
  2. Step 2: Convert to fraction form
    210.80/315.90 = 174.47/x
  3. Step 3: Cross multiply
    210.80x = 315.90 × 174.47
  4. Step 4: Simplify right side
    210.80x = 55,113.49
  5. Step 5: Solve for x
    x = 55,113.49/210.80
  6. Step 6: Final answer
    x = 261.46

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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.