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Finding the Fourth Proportional to 120,638.40, 180,957.60 and 90,700.80

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Solution

The fourth proportional to 120,638.40, 180,957.60 and 90,700.80 is: 136,051.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,638.40 : 180,957.60 = 90,700.80 : x
  2. Step 2: Convert to fraction form
    120,638.40/180,957.60 = 90,700.80/x
  3. Step 3: Cross multiply
    120,638.40x = 180,957.60 × 90,700.80
  4. Step 4: Simplify right side
    120,638.40x = 16,412,999,086.08
  5. Step 5: Solve for x
    x = 16,412,999,086.08/120,638.40
  6. Step 6: Final answer
    x = 136,051.20

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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.