Home / 85,435.90-128,153.85-80,515.15

Finding the Fourth Proportional to 85,435.90, 128,153.85 and 80,515.15

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Solution

The fourth proportional to 85,435.90, 128,153.85 and 80,515.15 is: 120,772.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,435.90 : 128,153.85 = 80,515.15 : x
  2. Step 2: Convert to fraction form
    85,435.90/128,153.85 = 80,515.15/x
  3. Step 3: Cross multiply
    85,435.90x = 128,153.85 × 80,515.15
  4. Step 4: Simplify right side
    85,435.90x = 10,318,326,455.83
  5. Step 5: Solve for x
    x = 10,318,326,455.83/85,435.90
  6. Step 6: Final answer
    x = 120,772.73

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Similar ratio
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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.