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Finding the Fourth Proportional to 128,761.86, 192,893.70 and 72,430.80

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Solution

The fourth proportional to 128,761.86, 192,893.70 and 72,430.80 is: 108,506.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,761.86 : 192,893.70 = 72,430.80 : x
  2. Step 2: Convert to fraction form
    128,761.86/192,893.70 = 72,430.80/x
  3. Step 3: Cross multiply
    128,761.86x = 192,893.70 × 72,430.80
  4. Step 4: Simplify right side
    128,761.86x = 13,971,445,005.96
  5. Step 5: Solve for x
    x = 13,971,445,005.96/128,761.86
  6. Step 6: Final answer
    x = 108,506.08

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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.