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Finding the Fourth Proportional to 71,120.60, 106,680.20 and 28,990.80

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Solution

The fourth proportional to 71,120.60, 106,680.20 and 28,990.80 is: 43,485.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,120.60 : 106,680.20 = 28,990.80 : x
  2. Step 2: Convert to fraction form
    71,120.60/106,680.20 = 28,990.80/x
  3. Step 3: Cross multiply
    71,120.60x = 106,680.20 × 28,990.80
  4. Step 4: Simplify right side
    71,120.60x = 3,092,744,342.16
  5. Step 5: Solve for x
    x = 3,092,744,342.16/71,120.60
  6. Step 6: Final answer
    x = 43,485.91

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1.5x scale

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.