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Finding the Fourth Proportional to 156.89, 216.50 and 86.94

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Solution

The fourth proportional to 156.89, 216.50 and 86.94 is: 119.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.89 : 216.50 = 86.94 : x
  2. Step 2: Convert to fraction form
    156.89/216.50 = 86.94/x
  3. Step 3: Cross multiply
    156.89x = 216.50 × 86.94
  4. Step 4: Simplify right side
    156.89x = 18,822.51
  5. Step 5: Solve for x
    x = 18,822.51/156.89
  6. Step 6: Final answer
    x = 119.97

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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.