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Finding the Fourth Proportional to 104.08, 156.70 and 91.32

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Solution

The fourth proportional to 104.08, 156.70 and 91.32 is: 137.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.08 : 156.70 = 91.32 : x
  2. Step 2: Convert to fraction form
    104.08/156.70 = 91.32/x
  3. Step 3: Cross multiply
    104.08x = 156.70 × 91.32
  4. Step 4: Simplify right side
    104.08x = 14,309.84
  5. Step 5: Solve for x
    x = 14,309.84/104.08
  6. Step 6: Final answer
    x = 137.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.