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Finding the Fourth Proportional to 85,422.60, 128,133.90 and 49,847.40

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Solution

The fourth proportional to 85,422.60, 128,133.90 and 49,847.40 is: 74,771.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,422.60 : 128,133.90 = 49,847.40 : x
  2. Step 2: Convert to fraction form
    85,422.60/128,133.90 = 49,847.40/x
  3. Step 3: Cross multiply
    85,422.60x = 128,133.90 × 49,847.40
  4. Step 4: Simplify right side
    85,422.60x = 6,387,141,766.86
  5. Step 5: Solve for x
    x = 6,387,141,766.86/85,422.60
  6. Step 6: Final answer
    x = 74,771.10

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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.