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Finding the Fourth Proportional to 469.25, 647.45 and 272.72

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Solution

The fourth proportional to 469.25, 647.45 and 272.72 is: 376.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.25 : 647.45 = 272.72 : x
  2. Step 2: Convert to fraction form
    469.25/647.45 = 272.72/x
  3. Step 3: Cross multiply
    469.25x = 647.45 × 272.72
  4. Step 4: Simplify right side
    469.25x = 176,574.86
  5. Step 5: Solve for x
    x = 176,574.86/469.25
  6. Step 6: Final answer
    x = 376.29

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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.