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Finding the Fourth Proportional to 128.48, 192.53 and 85.02

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Solution

The fourth proportional to 128.48, 192.53 and 85.02 is: 127.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 192.53 = 85.02 : x
  2. Step 2: Convert to fraction form
    128.48/192.53 = 85.02/x
  3. Step 3: Cross multiply
    128.48x = 192.53 × 85.02
  4. Step 4: Simplify right side
    128.48x = 16,368.39
  5. Step 5: Solve for x
    x = 16,368.39/128.48
  6. Step 6: Final answer
    x = 127.41

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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.