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Finding the Fourth Proportional to 140.43, 210.29 and 128.55

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Solution

The fourth proportional to 140.43, 210.29 and 128.55 is: 192.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.43 : 210.29 = 128.55 : x
  2. Step 2: Convert to fraction form
    140.43/210.29 = 128.55/x
  3. Step 3: Cross multiply
    140.43x = 210.29 × 128.55
  4. Step 4: Simplify right side
    140.43x = 27,032.14
  5. Step 5: Solve for x
    x = 27,032.14/140.43
  6. Step 6: Final answer
    x = 192.50

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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.