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Finding the Fourth Proportional to 128,262.96, 192,020.40 and 85,615.92

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Solution

The fourth proportional to 128,262.96, 192,020.40 and 85,615.92 is: 128,174.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,262.96 : 192,020.40 = 85,615.92 : x
  2. Step 2: Convert to fraction form
    128,262.96/192,020.40 = 85,615.92/x
  3. Step 3: Cross multiply
    128,262.96x = 192,020.40 × 85,615.92
  4. Step 4: Simplify right side
    128,262.96x = 16,440,003,204.77
  5. Step 5: Solve for x
    x = 16,440,003,204.77/128,262.96
  6. Step 6: Final answer
    x = 128,174.21

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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.