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Finding the Fourth Proportional to 128.93, 192.56 and 90.07

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Solution

The fourth proportional to 128.93, 192.56 and 90.07 is: 134.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.93 : 192.56 = 90.07 : x
  2. Step 2: Convert to fraction form
    128.93/192.56 = 90.07/x
  3. Step 3: Cross multiply
    128.93x = 192.56 × 90.07
  4. Step 4: Simplify right side
    128.93x = 17,342.95
  5. Step 5: Solve for x
    x = 17,342.95/128.93
  6. Step 6: Final answer
    x = 134.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.