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Finding the Fourth Proportional to 85,409.85, 128,193.17 and 43,319.24

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Solution

The fourth proportional to 85,409.85, 128,193.17 and 43,319.24 is: 65,018.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.85 : 128,193.17 = 43,319.24 : x
  2. Step 2: Convert to fraction form
    85,409.85/128,193.17 = 43,319.24/x
  3. Step 3: Cross multiply
    85,409.85x = 128,193.17 × 43,319.24
  4. Step 4: Simplify right side
    85,409.85x = 5,553,229,840.03
  5. Step 5: Solve for x
    x = 5,553,229,840.03/85,409.85
  6. Step 6: Final answer
    x = 65,018.61

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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.