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Finding the Fourth Proportional to 85,959.60, 128,861.64 and 30,542.64

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Solution

The fourth proportional to 85,959.60, 128,861.64 and 30,542.64 is: 45,786.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,959.60 : 128,861.64 = 30,542.64 : x
  2. Step 2: Convert to fraction form
    85,959.60/128,861.64 = 30,542.64/x
  3. Step 3: Cross multiply
    85,959.60x = 128,861.64 × 30,542.64
  4. Step 4: Simplify right side
    85,959.60x = 3,935,774,680.33
  5. Step 5: Solve for x
    x = 3,935,774,680.33/85,959.60
  6. Step 6: Final answer
    x = 45,786.33

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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.