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Finding the Fourth Proportional to 85,765.46, 128,611.73 and 35,129.58

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Solution

The fourth proportional to 85,765.46, 128,611.73 and 35,129.58 is: 52,679.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,765.46 : 128,611.73 = 35,129.58 : x
  2. Step 2: Convert to fraction form
    85,765.46/128,611.73 = 35,129.58/x
  3. Step 3: Cross multiply
    85,765.46x = 128,611.73 × 35,129.58
  4. Step 4: Simplify right side
    85,765.46x = 4,518,075,414.91
  5. Step 5: Solve for x
    x = 4,518,075,414.91/85,765.46
  6. Step 6: Final answer
    x = 52,679.43

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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.