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Finding the Fourth Proportional to 143.60, 214.10 and 139.80

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Solution

The fourth proportional to 143.60, 214.10 and 139.80 is: 208.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.60 : 214.10 = 139.80 : x
  2. Step 2: Convert to fraction form
    143.60/214.10 = 139.80/x
  3. Step 3: Cross multiply
    143.60x = 214.10 × 139.80
  4. Step 4: Simplify right side
    143.60x = 29,931.18
  5. Step 5: Solve for x
    x = 29,931.18/143.60
  6. Step 6: Final answer
    x = 208.43

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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.