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Finding the Fourth Proportional to 85,679.90, 128,453.93 and 43,525.34

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Solution

The fourth proportional to 85,679.90, 128,453.93 and 43,525.34 is: 65,254.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,679.90 : 128,453.93 = 43,525.34 : x
  2. Step 2: Convert to fraction form
    85,679.90/128,453.93 = 43,525.34/x
  3. Step 3: Cross multiply
    85,679.90x = 128,453.93 × 43,525.34
  4. Step 4: Simplify right side
    85,679.90x = 5,591,000,977.59
  5. Step 5: Solve for x
    x = 5,591,000,977.59/85,679.90
  6. Step 6: Final answer
    x = 65,254.52

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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.