Home / 208,015.40-312,023.10-128,181.80

Finding the Fourth Proportional to 208,015.40, 312,023.10 and 128,181.80

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Solution

The fourth proportional to 208,015.40, 312,023.10 and 128,181.80 is: 192,272.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,015.40 : 312,023.10 = 128,181.80 : x
  2. Step 2: Convert to fraction form
    208,015.40/312,023.10 = 128,181.80/x
  3. Step 3: Cross multiply
    208,015.40x = 312,023.10 × 128,181.80
  4. Step 4: Simplify right side
    208,015.40x = 39,995,682,599.58
  5. Step 5: Solve for x
    x = 39,995,682,599.58/208,015.40
  6. Step 6: Final answer
    x = 192,272.70

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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.