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Finding the Fourth Proportional to 85,325.40, 128,021.40 and 35,392.86

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Solution

The fourth proportional to 85,325.40, 128,021.40 and 35,392.86 is: 53,103.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,325.40 : 128,021.40 = 35,392.86 : x
  2. Step 2: Convert to fraction form
    85,325.40/128,021.40 = 35,392.86/x
  3. Step 3: Cross multiply
    85,325.40x = 128,021.40 × 35,392.86
  4. Step 4: Simplify right side
    85,325.40x = 4,531,043,487.20
  5. Step 5: Solve for x
    x = 4,531,043,487.20/85,325.40
  6. Step 6: Final answer
    x = 53,103.10

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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.