Home / 690,770.32-1,035,009.96-420,079.60

Finding the Fourth Proportional to 690,770.32, 1,035,009.96 and 420,079.60

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Solution

The fourth proportional to 690,770.32, 1,035,009.96 and 420,079.60 is: 629,422.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,770.32 : 1,035,009.96 = 420,079.60 : x
  2. Step 2: Convert to fraction form
    690,770.32/1,035,009.96 = 420,079.60/x
  3. Step 3: Cross multiply
    690,770.32x = 1,035,009.96 × 420,079.60
  4. Step 4: Simplify right side
    690,770.32x = 434,786,569,992.82
  5. Step 5: Solve for x
    x = 434,786,569,992.82/690,770.32
  6. Step 6: Final answer
    x = 629,422.77

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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.