Home / 85,769.60-128,627.12-80,172.36

Finding the Fourth Proportional to 85,769.60, 128,627.12 and 80,172.36

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Solution

The fourth proportional to 85,769.60, 128,627.12 and 80,172.36 is: 120,233.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,769.60 : 128,627.12 = 80,172.36 : x
  2. Step 2: Convert to fraction form
    85,769.60/128,627.12 = 80,172.36/x
  3. Step 3: Cross multiply
    85,769.60x = 128,627.12 × 80,172.36
  4. Step 4: Simplify right side
    85,769.60x = 10,312,339,970.83
  5. Step 5: Solve for x
    x = 10,312,339,970.83/85,769.60
  6. Step 6: Final answer
    x = 120,233.05

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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.