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Finding the Fourth Proportional to 85,859.40, 128,789.10 and 81,485.40

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Solution

The fourth proportional to 85,859.40, 128,789.10 and 81,485.40 is: 122,228.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,859.40 : 128,789.10 = 81,485.40 : x
  2. Step 2: Convert to fraction form
    85,859.40/128,789.10 = 81,485.40/x
  3. Step 3: Cross multiply
    85,859.40x = 128,789.10 × 81,485.40
  4. Step 4: Simplify right side
    85,859.40x = 10,494,431,329.14
  5. Step 5: Solve for x
    x = 10,494,431,329.14/85,859.40
  6. Step 6: Final answer
    x = 122,228.10

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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.