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Finding the Fourth Proportional to 128,168.90, 192,271.71 and 39,429.86

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Solution

The fourth proportional to 128,168.90, 192,271.71 and 39,429.86 is: 59,150.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,168.90 : 192,271.71 = 39,429.86 : x
  2. Step 2: Convert to fraction form
    128,168.90/192,271.71 = 39,429.86/x
  3. Step 3: Cross multiply
    128,168.90x = 192,271.71 × 39,429.86
  4. Step 4: Simplify right side
    128,168.90x = 7,581,245,645.90
  5. Step 5: Solve for x
    x = 7,581,245,645.90/128,168.90
  6. Step 6: Final answer
    x = 59,150.43

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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.