Home / 128,140.20-192,210.30-83,903.40

Finding the Fourth Proportional to 128,140.20, 192,210.30 and 83,903.40

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Solution

The fourth proportional to 128,140.20, 192,210.30 and 83,903.40 is: 125,855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,140.20 : 192,210.30 = 83,903.40 : x
  2. Step 2: Convert to fraction form
    128,140.20/192,210.30 = 83,903.40/x
  3. Step 3: Cross multiply
    128,140.20x = 192,210.30 × 83,903.40
  4. Step 4: Simplify right side
    128,140.20x = 16,127,097,685.02
  5. Step 5: Solve for x
    x = 16,127,097,685.02/128,140.20
  6. Step 6: Final answer
    x = 125,855.10

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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.