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Finding the Fourth Proportional to 128,718.80, 193,078.20 and 45,621.20

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Solution

The fourth proportional to 128,718.80, 193,078.20 and 45,621.20 is: 68,431.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,718.80 : 193,078.20 = 45,621.20 : x
  2. Step 2: Convert to fraction form
    128,718.80/193,078.20 = 45,621.20/x
  3. Step 3: Cross multiply
    128,718.80x = 193,078.20 × 45,621.20
  4. Step 4: Simplify right side
    128,718.80x = 8,808,459,177.84
  5. Step 5: Solve for x
    x = 8,808,459,177.84/128,718.80
  6. Step 6: Final answer
    x = 68,431.80

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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.