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Finding the Fourth Proportional to 113.21, 156.06 and 87.09

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Solution

The fourth proportional to 113.21, 156.06 and 87.09 is: 120.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.21 : 156.06 = 87.09 : x
  2. Step 2: Convert to fraction form
    113.21/156.06 = 87.09/x
  3. Step 3: Cross multiply
    113.21x = 156.06 × 87.09
  4. Step 4: Simplify right side
    113.21x = 13,590.83
  5. Step 5: Solve for x
    x = 13,590.83/113.21
  6. Step 6: Final answer
    x = 120.05

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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.