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Finding the Fourth Proportional to 156.18, 234.21 and 53.43

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Solution

The fourth proportional to 156.18, 234.21 and 53.43 is: 80.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.18 : 234.21 = 53.43 : x
  2. Step 2: Convert to fraction form
    156.18/234.21 = 53.43/x
  3. Step 3: Cross multiply
    156.18x = 234.21 × 53.43
  4. Step 4: Simplify right side
    156.18x = 12,513.84
  5. Step 5: Solve for x
    x = 12,513.84/156.18
  6. Step 6: Final answer
    x = 80.12

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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.