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Finding the Fourth Proportional to 128,409.10, 192,634.17 and 39,641.74

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Solution

The fourth proportional to 128,409.10, 192,634.17 and 39,641.74 is: 59,468.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,409.10 : 192,634.17 = 39,641.74 : x
  2. Step 2: Convert to fraction form
    128,409.10/192,634.17 = 39,641.74/x
  3. Step 3: Cross multiply
    128,409.10x = 192,634.17 × 39,641.74
  4. Step 4: Simplify right side
    128,409.10x = 7,636,353,682.26
  5. Step 5: Solve for x
    x = 7,636,353,682.26/128,409.10
  6. Step 6: Final answer
    x = 59,468.94

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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.