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Finding the Fourth Proportional to 218.74, 302.12 and 145.40

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Solution

The fourth proportional to 218.74, 302.12 and 145.40 is: 200.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.74 : 302.12 = 145.40 : x
  2. Step 2: Convert to fraction form
    218.74/302.12 = 145.40/x
  3. Step 3: Cross multiply
    218.74x = 302.12 × 145.40
  4. Step 4: Simplify right side
    218.74x = 43,928.25
  5. Step 5: Solve for x
    x = 43,928.25/218.74
  6. Step 6: Final answer
    x = 200.82

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Why These Related Problems?

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