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Finding the Fourth Proportional to 128,021.80, 191,946.30 and 68,060.20

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Solution

The fourth proportional to 128,021.80, 191,946.30 and 68,060.20 is: 102,044.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.80 : 191,946.30 = 68,060.20 : x
  2. Step 2: Convert to fraction form
    128,021.80/191,946.30 = 68,060.20/x
  3. Step 3: Cross multiply
    128,021.80x = 191,946.30 × 68,060.20
  4. Step 4: Simplify right side
    128,021.80x = 13,063,903,567.26
  5. Step 5: Solve for x
    x = 13,063,903,567.26/128,021.80
  6. Step 6: Final answer
    x = 102,044.37

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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.