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Finding the Fourth Proportional to 120,640.40, 180,960.60 and 90,702.80

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Solution

The fourth proportional to 120,640.40, 180,960.60 and 90,702.80 is: 136,054.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,640.40 : 180,960.60 = 90,702.80 : x
  2. Step 2: Convert to fraction form
    120,640.40/180,960.60 = 90,702.80/x
  3. Step 3: Cross multiply
    120,640.40x = 180,960.60 × 90,702.80
  4. Step 4: Simplify right side
    120,640.40x = 16,413,633,109.68
  5. Step 5: Solve for x
    x = 16,413,633,109.68/120,640.40
  6. Step 6: Final answer
    x = 136,054.20

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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.