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Finding the Fourth Proportional to 85,912.90, 128,869.35 and 80,080.90

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Solution

The fourth proportional to 85,912.90, 128,869.35 and 80,080.90 is: 120,121.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.90 : 128,869.35 = 80,080.90 : x
  2. Step 2: Convert to fraction form
    85,912.90/128,869.35 = 80,080.90/x
  3. Step 3: Cross multiply
    85,912.90x = 128,869.35 × 80,080.90
  4. Step 4: Simplify right side
    85,912.90x = 10,319,973,530.42
  5. Step 5: Solve for x
    x = 10,319,973,530.42/85,912.90
  6. Step 6: Final answer
    x = 120,121.35

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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.