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Finding the Fourth Proportional to 113.09, 156.21 and 99.32

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Solution

The fourth proportional to 113.09, 156.21 and 99.32 is: 137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.09 : 156.21 = 99.32 : x
  2. Step 2: Convert to fraction form
    113.09/156.21 = 99.32/x
  3. Step 3: Cross multiply
    113.09x = 156.21 × 99.32
  4. Step 4: Simplify right side
    113.09x = 15,514.78
  5. Step 5: Solve for x
    x = 15,514.78/113.09
  6. Step 6: Final answer
    x = 137.19

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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.