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Finding the Fourth Proportional to 304.65, 420.18 and 258.15

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Solution

The fourth proportional to 304.65, 420.18 and 258.15 is: 356.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.65 : 420.18 = 258.15 : x
  2. Step 2: Convert to fraction form
    304.65/420.18 = 258.15/x
  3. Step 3: Cross multiply
    304.65x = 420.18 × 258.15
  4. Step 4: Simplify right side
    304.65x = 108,469.47
  5. Step 5: Solve for x
    x = 108,469.47/304.65
  6. Step 6: Final answer
    x = 356.05

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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.