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Finding the Fourth Proportional to 711,429.95, 981,761.78 and 389,137.23

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Solution

The fourth proportional to 711,429.95, 981,761.78 and 389,137.23 is: 537,003.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,429.95 : 981,761.78 = 389,137.23 : x
  2. Step 2: Convert to fraction form
    711,429.95/981,761.78 = 389,137.23/x
  3. Step 3: Cross multiply
    711,429.95x = 981,761.78 × 389,137.23
  4. Step 4: Simplify right side
    711,429.95x = 382,040,060,561.91
  5. Step 5: Solve for x
    x = 382,040,060,561.91/711,429.95
  6. Step 6: Final answer
    x = 537,003.06

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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.