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Finding the Fourth Proportional to 128.51, 191.43 and 124.93

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Solution

The fourth proportional to 128.51, 191.43 and 124.93 is: 186.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.51 : 191.43 = 124.93 : x
  2. Step 2: Convert to fraction form
    128.51/191.43 = 124.93/x
  3. Step 3: Cross multiply
    128.51x = 191.43 × 124.93
  4. Step 4: Simplify right side
    128.51x = 23,915.35
  5. Step 5: Solve for x
    x = 23,915.35/128.51
  6. Step 6: Final answer
    x = 186.10

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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.