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Finding the Fourth Proportional to 128,676.80, 192,950.40 and 76,102.40

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Solution

The fourth proportional to 128,676.80, 192,950.40 and 76,102.40 is: 114,115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,676.80 : 192,950.40 = 76,102.40 : x
  2. Step 2: Convert to fraction form
    128,676.80/192,950.40 = 76,102.40/x
  3. Step 3: Cross multiply
    128,676.80x = 192,950.40 × 76,102.40
  4. Step 4: Simplify right side
    128,676.80x = 14,683,988,520.96
  5. Step 5: Solve for x
    x = 14,683,988,520.96/128,676.80
  6. Step 6: Final answer
    x = 114,115.28

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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.