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Finding the Fourth Proportional to 128,521.40, 192,810.90 and 49,628.60

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Solution

The fourth proportional to 128,521.40, 192,810.90 and 49,628.60 is: 74,454.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.40 : 192,810.90 = 49,628.60 : x
  2. Step 2: Convert to fraction form
    128,521.40/192,810.90 = 49,628.60/x
  3. Step 3: Cross multiply
    128,521.40x = 192,810.90 × 49,628.60
  4. Step 4: Simplify right side
    128,521.40x = 9,568,935,031.74
  5. Step 5: Solve for x
    x = 9,568,935,031.74/128,521.40
  6. Step 6: Final answer
    x = 74,454.02

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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.