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Finding the Fourth Proportional to 156.61, 215.99 and 119.70

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Solution

The fourth proportional to 156.61, 215.99 and 119.70 is: 165.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.61 : 215.99 = 119.70 : x
  2. Step 2: Convert to fraction form
    156.61/215.99 = 119.70/x
  3. Step 3: Cross multiply
    156.61x = 215.99 × 119.70
  4. Step 4: Simplify right side
    156.61x = 25,854.00
  5. Step 5: Solve for x
    x = 25,854.00/156.61
  6. Step 6: Final answer
    x = 165.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.