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Finding the Fourth Proportional to 288.72, 433.36 and 243.36

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Solution

The fourth proportional to 288.72, 433.36 and 243.36 is: 365.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.72 : 433.36 = 243.36 : x
  2. Step 2: Convert to fraction form
    288.72/433.36 = 243.36/x
  3. Step 3: Cross multiply
    288.72x = 433.36 × 243.36
  4. Step 4: Simplify right side
    288.72x = 105,462.49
  5. Step 5: Solve for x
    x = 105,462.49/288.72
  6. Step 6: Final answer
    x = 365.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.