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Finding the Fourth Proportional to 304.29, 420.07 and 215.85

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Solution

The fourth proportional to 304.29, 420.07 and 215.85 is: 297.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.29 : 420.07 = 215.85 : x
  2. Step 2: Convert to fraction form
    304.29/420.07 = 215.85/x
  3. Step 3: Cross multiply
    304.29x = 420.07 × 215.85
  4. Step 4: Simplify right side
    304.29x = 90,671.57
  5. Step 5: Solve for x
    x = 90,671.57/304.29
  6. Step 6: Final answer
    x = 297.98

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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.