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Finding the Fourth Proportional to 156.61, 234.82 and 83.40

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Solution

The fourth proportional to 156.61, 234.82 and 83.40 is: 125.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.61 : 234.82 = 83.40 : x
  2. Step 2: Convert to fraction form
    156.61/234.82 = 83.40/x
  3. Step 3: Cross multiply
    156.61x = 234.82 × 83.40
  4. Step 4: Simplify right side
    156.61x = 19,583.99
  5. Step 5: Solve for x
    x = 19,583.99/156.61
  6. Step 6: Final answer
    x = 125.05

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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.