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Finding the Fourth Proportional to 120,627.40, 180,941.10 and 90,689.80

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Solution

The fourth proportional to 120,627.40, 180,941.10 and 90,689.80 is: 136,034.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,627.40 : 180,941.10 = 90,689.80 : x
  2. Step 2: Convert to fraction form
    120,627.40/180,941.10 = 90,689.80/x
  3. Step 3: Cross multiply
    120,627.40x = 180,941.10 × 90,689.80
  4. Step 4: Simplify right side
    120,627.40x = 16,409,512,170.78
  5. Step 5: Solve for x
    x = 16,409,512,170.78/120,627.40
  6. Step 6: Final answer
    x = 136,034.70

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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.