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Finding the Fourth Proportional to 128,072.60, 192,108.90 and 69,023.60

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Solution

The fourth proportional to 128,072.60, 192,108.90 and 69,023.60 is: 103,535.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.60 : 192,108.90 = 69,023.60 : x
  2. Step 2: Convert to fraction form
    128,072.60/192,108.90 = 69,023.60/x
  3. Step 3: Cross multiply
    128,072.60x = 192,108.90 × 69,023.60
  4. Step 4: Simplify right side
    128,072.60x = 13,260,047,870.04
  5. Step 5: Solve for x
    x = 13,260,047,870.04/128,072.60
  6. Step 6: Final answer
    x = 103,535.40

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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.