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Finding the Fourth Proportional to 120,728.40, 180,946.80 and 61,533.60

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Solution

The fourth proportional to 120,728.40, 180,946.80 and 61,533.60 is: 92,226.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,728.40 : 180,946.80 = 61,533.60 : x
  2. Step 2: Convert to fraction form
    120,728.40/180,946.80 = 61,533.60/x
  3. Step 3: Cross multiply
    120,728.40x = 180,946.80 × 61,533.60
  4. Step 4: Simplify right side
    120,728.40x = 11,134,308,012.48
  5. Step 5: Solve for x
    x = 11,134,308,012.48/120,728.40
  6. Step 6: Final answer
    x = 92,226.09

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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.