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Finding the Fourth Proportional to 85,534.40, 128,058.60 and 80,879.60

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Solution

The fourth proportional to 85,534.40, 128,058.60 and 80,879.60 is: 121,089.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,534.40 : 128,058.60 = 80,879.60 : x
  2. Step 2: Convert to fraction form
    85,534.40/128,058.60 = 80,879.60/x
  3. Step 3: Cross multiply
    85,534.40x = 128,058.60 × 80,879.60
  4. Step 4: Simplify right side
    85,534.40x = 10,357,328,344.56
  5. Step 5: Solve for x
    x = 10,357,328,344.56/85,534.40
  6. Step 6: Final answer
    x = 121,089.62

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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.