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Finding the Fourth Proportional to 361.40, 542.18 and 145.00

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Solution

The fourth proportional to 361.40, 542.18 and 145.00 is: 217.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.40 : 542.18 = 145.00 : x
  2. Step 2: Convert to fraction form
    361.40/542.18 = 145.00/x
  3. Step 3: Cross multiply
    361.40x = 542.18 × 145.00
  4. Step 4: Simplify right side
    361.40x = 78,614.02
  5. Step 5: Solve for x
    x = 78,614.02/361.40
  6. Step 6: Final answer
    x = 217.52

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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.