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Finding the Fourth Proportional to 85,855.40, 128,783.10 and 57,861.80

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Solution

The fourth proportional to 85,855.40, 128,783.10 and 57,861.80 is: 86,792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.40 : 128,783.10 = 57,861.80 : x
  2. Step 2: Convert to fraction form
    85,855.40/128,783.10 = 57,861.80/x
  3. Step 3: Cross multiply
    85,855.40x = 128,783.10 × 57,861.80
  4. Step 4: Simplify right side
    85,855.40x = 7,451,621,975.58
  5. Step 5: Solve for x
    x = 7,451,621,975.58/85,855.40
  6. Step 6: Final answer
    x = 86,792.70

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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.