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Finding the Fourth Proportional to 303.90, 455.92 and 87.47

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Solution

The fourth proportional to 303.90, 455.92 and 87.47 is: 131.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.90 : 455.92 = 87.47 : x
  2. Step 2: Convert to fraction form
    303.90/455.92 = 87.47/x
  3. Step 3: Cross multiply
    303.90x = 455.92 × 87.47
  4. Step 4: Simplify right side
    303.90x = 39,878.53
  5. Step 5: Solve for x
    x = 39,878.53/303.90
  6. Step 6: Final answer
    x = 131.22

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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.