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Finding the Fourth Proportional to 104,512.80, 156,538.80 and 90,688.80

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Solution

The fourth proportional to 104,512.80, 156,538.80 and 90,688.80 is: 135,833.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,512.80 : 156,538.80 = 90,688.80 : x
  2. Step 2: Convert to fraction form
    104,512.80/156,538.80 = 90,688.80/x
  3. Step 3: Cross multiply
    104,512.80x = 156,538.80 × 90,688.80
  4. Step 4: Simplify right side
    104,512.80x = 14,196,315,925.44
  5. Step 5: Solve for x
    x = 14,196,315,925.44/104,512.80
  6. Step 6: Final answer
    x = 135,833.28

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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.