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Finding the Fourth Proportional to 104.32, 156.30 and 90.64

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Solution

The fourth proportional to 104.32, 156.30 and 90.64 is: 135.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.32 : 156.30 = 90.64 : x
  2. Step 2: Convert to fraction form
    104.32/156.30 = 90.64/x
  3. Step 3: Cross multiply
    104.32x = 156.30 × 90.64
  4. Step 4: Simplify right side
    104.32x = 14,167.03
  5. Step 5: Solve for x
    x = 14,167.03/104.32
  6. Step 6: Final answer
    x = 135.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.