Home / 128,769.86-192,905.70-72,438.80

Finding the Fourth Proportional to 128,769.86, 192,905.70 and 72,438.80

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Solution

The fourth proportional to 128,769.86, 192,905.70 and 72,438.80 is: 108,518.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,769.86 : 192,905.70 = 72,438.80 : x
  2. Step 2: Convert to fraction form
    128,769.86/192,905.70 = 72,438.80/x
  3. Step 3: Cross multiply
    128,769.86x = 192,905.70 × 72,438.80
  4. Step 4: Simplify right side
    128,769.86x = 13,973,857,421.16
  5. Step 5: Solve for x
    x = 13,973,857,421.16/128,769.86
  6. Step 6: Final answer
    x = 108,518.08

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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.