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Finding the Fourth Proportional to 128.59, 192.83 and 47.38

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Solution

The fourth proportional to 128.59, 192.83 and 47.38 is: 71.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.59 : 192.83 = 47.38 : x
  2. Step 2: Convert to fraction form
    128.59/192.83 = 47.38/x
  3. Step 3: Cross multiply
    128.59x = 192.83 × 47.38
  4. Step 4: Simplify right side
    128.59x = 9,136.29
  5. Step 5: Solve for x
    x = 9,136.29/128.59
  6. Step 6: Final answer
    x = 71.05

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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.