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Finding the Fourth Proportional to 469.19, 647.46 and 272.72

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Solution

The fourth proportional to 469.19, 647.46 and 272.72 is: 376.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.19 : 647.46 = 272.72 : x
  2. Step 2: Convert to fraction form
    469.19/647.46 = 272.72/x
  3. Step 3: Cross multiply
    469.19x = 647.46 × 272.72
  4. Step 4: Simplify right side
    469.19x = 176,572.05
  5. Step 5: Solve for x
    x = 176,572.05/469.19
  6. Step 6: Final answer
    x = 376.34

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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.