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Finding the Fourth Proportional to 304.98, 421.29 and 258.86

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Solution

The fourth proportional to 304.98, 421.29 and 258.86 is: 357.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.98 : 421.29 = 258.86 : x
  2. Step 2: Convert to fraction form
    304.98/421.29 = 258.86/x
  3. Step 3: Cross multiply
    304.98x = 421.29 × 258.86
  4. Step 4: Simplify right side
    304.98x = 109,053.02
  5. Step 5: Solve for x
    x = 109,053.02/304.98
  6. Step 6: Final answer
    x = 357.57

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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.