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Finding the Fourth Proportional to 156.22, 215.57 and 89.85

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Solution

The fourth proportional to 156.22, 215.57 and 89.85 is: 123.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.22 : 215.57 = 89.85 : x
  2. Step 2: Convert to fraction form
    156.22/215.57 = 89.85/x
  3. Step 3: Cross multiply
    156.22x = 215.57 × 89.85
  4. Step 4: Simplify right side
    156.22x = 19,369.32
  5. Step 5: Solve for x
    x = 19,369.32/156.22
  6. Step 6: Final answer
    x = 123.99

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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.