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Finding the Fourth Proportional to 711,435.12, 981,759.58 and 389,138.24

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Solution

The fourth proportional to 711,435.12, 981,759.58 and 389,138.24 is: 536,999.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,435.12 : 981,759.58 = 389,138.24 : x
  2. Step 2: Convert to fraction form
    711,435.12/981,759.58 = 389,138.24/x
  3. Step 3: Cross multiply
    711,435.12x = 981,759.58 × 389,138.24
  4. Step 4: Simplify right side
    711,435.12x = 382,040,195,064.34
  5. Step 5: Solve for x
    x = 382,040,195,064.34/711,435.12
  6. Step 6: Final answer
    x = 536,999.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.