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Finding the Fourth Proportional to 128,556.54, 192,907.71 and 69,390.90

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Solution

The fourth proportional to 128,556.54, 192,907.71 and 69,390.90 is: 104,125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,556.54 : 192,907.71 = 69,390.90 : x
  2. Step 2: Convert to fraction form
    128,556.54/192,907.71 = 69,390.90/x
  3. Step 3: Cross multiply
    128,556.54x = 192,907.71 × 69,390.90
  4. Step 4: Simplify right side
    128,556.54x = 13,386,039,613.84
  5. Step 5: Solve for x
    x = 13,386,039,613.84/128,556.54
  6. Step 6: Final answer
    x = 104,125.70

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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.