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Finding the Fourth Proportional to 145.42, 218.18 and 54.13

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Solution

The fourth proportional to 145.42, 218.18 and 54.13 is: 81.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.42 : 218.18 = 54.13 : x
  2. Step 2: Convert to fraction form
    145.42/218.18 = 54.13/x
  3. Step 3: Cross multiply
    145.42x = 218.18 × 54.13
  4. Step 4: Simplify right side
    145.42x = 11,808.99
  5. Step 5: Solve for x
    x = 11,808.99/145.42
  6. Step 6: Final answer
    x = 81.21

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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.