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Finding the Fourth Proportional to 71,240.40, 106,860.60 and 68,518.80

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Solution

The fourth proportional to 71,240.40, 106,860.60 and 68,518.80 is: 102,778.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,240.40 : 106,860.60 = 68,518.80 : x
  2. Step 2: Convert to fraction form
    71,240.40/106,860.60 = 68,518.80/x
  3. Step 3: Cross multiply
    71,240.40x = 106,860.60 × 68,518.80
  4. Step 4: Simplify right side
    71,240.40x = 7,321,960,079.28
  5. Step 5: Solve for x
    x = 7,321,960,079.28/71,240.40
  6. Step 6: Final answer
    x = 102,778.20

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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.