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Finding the Fourth Proportional to 303.35, 455.09 and 86.91

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Solution

The fourth proportional to 303.35, 455.09 and 86.91 is: 130.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.35 : 455.09 = 86.91 : x
  2. Step 2: Convert to fraction form
    303.35/455.09 = 86.91/x
  3. Step 3: Cross multiply
    303.35x = 455.09 × 86.91
  4. Step 4: Simplify right side
    303.35x = 39,549.73
  5. Step 5: Solve for x
    x = 39,549.73/303.35
  6. Step 6: Final answer
    x = 130.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.