Home / 89,921.20-134,703.60-78,840.40

Finding the Fourth Proportional to 89,921.20, 134,703.60 and 78,840.40

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Solution

The fourth proportional to 89,921.20, 134,703.60 and 78,840.40 is: 118,104.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,921.20 : 134,703.60 = 78,840.40 : x
  2. Step 2: Convert to fraction form
    89,921.20/134,703.60 = 78,840.40/x
  3. Step 3: Cross multiply
    89,921.20x = 134,703.60 × 78,840.40
  4. Step 4: Simplify right side
    89,921.20x = 10,620,085,705.44
  5. Step 5: Solve for x
    x = 10,620,085,705.44/89,921.20
  6. Step 6: Final answer
    x = 118,104.36

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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.