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Finding the Fourth Proportional to 85,471.80, 128,180.34 and 28,533.48

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Solution

The fourth proportional to 85,471.80, 128,180.34 and 28,533.48 is: 42,791.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,471.80 : 128,180.34 = 28,533.48 : x
  2. Step 2: Convert to fraction form
    85,471.80/128,180.34 = 28,533.48/x
  3. Step 3: Cross multiply
    85,471.80x = 128,180.34 × 28,533.48
  4. Step 4: Simplify right side
    85,471.80x = 3,657,431,167.78
  5. Step 5: Solve for x
    x = 3,657,431,167.78/85,471.80
  6. Step 6: Final answer
    x = 42,791.09

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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.