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Finding the Fourth Proportional to 185.43, 278.43 and 139.29

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Solution

The fourth proportional to 185.43, 278.43 and 139.29 is: 209.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.43 : 278.43 = 139.29 : x
  2. Step 2: Convert to fraction form
    185.43/278.43 = 139.29/x
  3. Step 3: Cross multiply
    185.43x = 278.43 × 139.29
  4. Step 4: Simplify right side
    185.43x = 38,782.51
  5. Step 5: Solve for x
    x = 38,782.51/185.43
  6. Step 6: Final answer
    x = 209.15

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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.