Home / 85,583.40-128,132.10-80,928.60

Finding the Fourth Proportional to 85,583.40, 128,132.10 and 80,928.60

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Solution

The fourth proportional to 85,583.40, 128,132.10 and 80,928.60 is: 121,163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,583.40 : 128,132.10 = 80,928.60 : x
  2. Step 2: Convert to fraction form
    85,583.40/128,132.10 = 80,928.60/x
  3. Step 3: Cross multiply
    85,583.40x = 128,132.10 × 80,928.60
  4. Step 4: Simplify right side
    85,583.40x = 10,369,551,468.06
  5. Step 5: Solve for x
    x = 10,369,551,468.06/85,583.40
  6. Step 6: Final answer
    x = 121,163.12

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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.