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Finding the Fourth Proportional to 85,803.75, 128,725.08 and 30,399.75

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Solution

The fourth proportional to 85,803.75, 128,725.08 and 30,399.75 is: 45,606.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,803.75 : 128,725.08 = 30,399.75 : x
  2. Step 2: Convert to fraction form
    85,803.75/128,725.08 = 30,399.75/x
  3. Step 3: Cross multiply
    85,803.75x = 128,725.08 × 30,399.75
  4. Step 4: Simplify right side
    85,803.75x = 3,913,210,250.73
  5. Step 5: Solve for x
    x = 3,913,210,250.73/85,803.75
  6. Step 6: Final answer
    x = 45,606.52

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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.