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Finding the Fourth Proportional to 469.22, 647.39 and 272.72

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Solution

The fourth proportional to 469.22, 647.39 and 272.72 is: 376.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.22 : 647.39 = 272.72 : x
  2. Step 2: Convert to fraction form
    469.22/647.39 = 272.72/x
  3. Step 3: Cross multiply
    469.22x = 647.39 × 272.72
  4. Step 4: Simplify right side
    469.22x = 176,558.50
  5. Step 5: Solve for x
    x = 176,558.50/469.22
  6. Step 6: Final answer
    x = 376.28

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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.