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Finding the Fourth Proportional to 290.72, 438.28 and 272.16

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Solution

The fourth proportional to 290.72, 438.28 and 272.16 is: 410.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.72 : 438.28 = 272.16 : x
  2. Step 2: Convert to fraction form
    290.72/438.28 = 272.16/x
  3. Step 3: Cross multiply
    290.72x = 438.28 × 272.16
  4. Step 4: Simplify right side
    290.72x = 119,282.28
  5. Step 5: Solve for x
    x = 119,282.28/290.72
  6. Step 6: Final answer
    x = 410.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.