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Finding the Fourth Proportional to 128,249.80, 192,374.70 and 69,200.80

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Solution

The fourth proportional to 128,249.80, 192,374.70 and 69,200.80 is: 103,801.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,249.80 : 192,374.70 = 69,200.80 : x
  2. Step 2: Convert to fraction form
    128,249.80/192,374.70 = 69,200.80/x
  3. Step 3: Cross multiply
    128,249.80x = 192,374.70 × 69,200.80
  4. Step 4: Simplify right side
    128,249.80x = 13,312,483,139.76
  5. Step 5: Solve for x
    x = 13,312,483,139.76/128,249.80
  6. Step 6: Final answer
    x = 103,801.20

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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.