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Finding the Fourth Proportional to 304.87, 420.76 and 231.06

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Solution

The fourth proportional to 304.87, 420.76 and 231.06 is: 318.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.87 : 420.76 = 231.06 : x
  2. Step 2: Convert to fraction form
    304.87/420.76 = 231.06/x
  3. Step 3: Cross multiply
    304.87x = 420.76 × 231.06
  4. Step 4: Simplify right side
    304.87x = 97,220.81
  5. Step 5: Solve for x
    x = 97,220.81/304.87
  6. Step 6: Final answer
    x = 318.90

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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.