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Finding the Fourth Proportional to 304.88, 420.72 and 216.56

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Solution

The fourth proportional to 304.88, 420.72 and 216.56 is: 298.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.88 : 420.72 = 216.56 : x
  2. Step 2: Convert to fraction form
    304.88/420.72 = 216.56/x
  3. Step 3: Cross multiply
    304.88x = 420.72 × 216.56
  4. Step 4: Simplify right side
    304.88x = 91,111.12
  5. Step 5: Solve for x
    x = 91,111.12/304.88
  6. Step 6: Final answer
    x = 298.84

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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.