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Finding the Fourth Proportional to 85,847.60, 128,771.40 and 84,389.60

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Solution

The fourth proportional to 85,847.60, 128,771.40 and 84,389.60 is: 126,584.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,847.60 : 128,771.40 = 84,389.60 : x
  2. Step 2: Convert to fraction form
    85,847.60/128,771.40 = 84,389.60/x
  3. Step 3: Cross multiply
    85,847.60x = 128,771.40 × 84,389.60
  4. Step 4: Simplify right side
    85,847.60x = 10,866,966,937.44
  5. Step 5: Solve for x
    x = 10,866,966,937.44/85,847.60
  6. Step 6: Final answer
    x = 126,584.40

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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.