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Finding the Fourth Proportional to 218.68, 301.45 and 139.98

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Solution

The fourth proportional to 218.68, 301.45 and 139.98 is: 192.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.68 : 301.45 = 139.98 : x
  2. Step 2: Convert to fraction form
    218.68/301.45 = 139.98/x
  3. Step 3: Cross multiply
    218.68x = 301.45 × 139.98
  4. Step 4: Simplify right side
    218.68x = 42,196.27
  5. Step 5: Solve for x
    x = 42,196.27/218.68
  6. Step 6: Final answer
    x = 192.96

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.