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Finding the Fourth Proportional to 128,504.80, 192,512.40 and 69,320.80

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Solution

The fourth proportional to 128,504.80, 192,512.40 and 69,320.80 is: 103,849.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,504.80 : 192,512.40 = 69,320.80 : x
  2. Step 2: Convert to fraction form
    128,504.80/192,512.40 = 69,320.80/x
  3. Step 3: Cross multiply
    128,504.80x = 192,512.40 × 69,320.80
  4. Step 4: Simplify right side
    128,504.80x = 13,345,113,577.92
  5. Step 5: Solve for x
    x = 13,345,113,577.92/128,504.80
  6. Step 6: Final answer
    x = 103,849.14

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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.