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Finding the Fourth Proportional to 251.40, 347.10 and 172.86

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Solution

The fourth proportional to 251.40, 347.10 and 172.86 is: 238.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.40 : 347.10 = 172.86 : x
  2. Step 2: Convert to fraction form
    251.40/347.10 = 172.86/x
  3. Step 3: Cross multiply
    251.40x = 347.10 × 172.86
  4. Step 4: Simplify right side
    251.40x = 59,999.71
  5. Step 5: Solve for x
    x = 59,999.71/251.40
  6. Step 6: Final answer
    x = 238.66

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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.