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Finding the Fourth Proportional to 128,990.40, 193,485.60 and 34,220.40

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Solution

The fourth proportional to 128,990.40, 193,485.60 and 34,220.40 is: 51,330.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.40 : 193,485.60 = 34,220.40 : x
  2. Step 2: Convert to fraction form
    128,990.40/193,485.60 = 34,220.40/x
  3. Step 3: Cross multiply
    128,990.40x = 193,485.60 × 34,220.40
  4. Step 4: Simplify right side
    128,990.40x = 6,621,154,626.24
  5. Step 5: Solve for x
    x = 6,621,154,626.24/128,990.40
  6. Step 6: Final answer
    x = 51,330.60

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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.