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Finding the Fourth Proportional to 128,638.80, 192,893.40 and 76,064.40

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Solution

The fourth proportional to 128,638.80, 192,893.40 and 76,064.40 is: 114,058.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.80 : 192,893.40 = 76,064.40 : x
  2. Step 2: Convert to fraction form
    128,638.80/192,893.40 = 76,064.40/x
  3. Step 3: Cross multiply
    128,638.80x = 192,893.40 × 76,064.40
  4. Step 4: Simplify right side
    128,638.80x = 14,672,320,734.96
  5. Step 5: Solve for x
    x = 14,672,320,734.96/128,638.80
  6. Step 6: Final answer
    x = 114,058.28

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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.