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Finding the Fourth Proportional to 145.49, 218.03 and 84.74

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Solution

The fourth proportional to 145.49, 218.03 and 84.74 is: 126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.49 : 218.03 = 84.74 : x
  2. Step 2: Convert to fraction form
    145.49/218.03 = 84.74/x
  3. Step 3: Cross multiply
    145.49x = 218.03 × 84.74
  4. Step 4: Simplify right side
    145.49x = 18,474.35
  5. Step 5: Solve for x
    x = 18,474.35/145.49
  6. Step 6: Final answer
    x = 126.98

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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.