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Finding the Fourth Proportional to 145.45, 218.08 and 54.15

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Solution

The fourth proportional to 145.45, 218.08 and 54.15 is: 81.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.45 : 218.08 = 54.15 : x
  2. Step 2: Convert to fraction form
    145.45/218.08 = 54.15/x
  3. Step 3: Cross multiply
    145.45x = 218.08 × 54.15
  4. Step 4: Simplify right side
    145.45x = 11,809.03
  5. Step 5: Solve for x
    x = 11,809.03/145.45
  6. Step 6: Final answer
    x = 81.19

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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.