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Finding the Fourth Proportional to 71,390.40, 106,855.20 and 65,860.80

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Solution

The fourth proportional to 71,390.40, 106,855.20 and 65,860.80 is: 98,578.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,390.40 : 106,855.20 = 65,860.80 : x
  2. Step 2: Convert to fraction form
    71,390.40/106,855.20 = 65,860.80/x
  3. Step 3: Cross multiply
    71,390.40x = 106,855.20 × 65,860.80
  4. Step 4: Simplify right side
    71,390.40x = 7,037,568,956.16
  5. Step 5: Solve for x
    x = 7,037,568,956.16/71,390.40
  6. Step 6: Final answer
    x = 98,578.65

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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.