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Finding the Fourth Proportional to 711,578.34, 981,990 and 389,290.68

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Solution

The fourth proportional to 711,578.34, 981,990 and 389,290.68 is: 537,227.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,578.34 : 981,990 = 389,290.68 : x
  2. Step 2: Convert to fraction form
    711,578.34/981,990 = 389,290.68/x
  3. Step 3: Cross multiply
    711,578.34x = 981,990 × 389,290.68
  4. Step 4: Simplify right side
    711,578.34x = 382,279,554,853.20
  5. Step 5: Solve for x
    x = 382,279,554,853.20/711,578.34
  6. Step 6: Final answer
    x = 537,227.64

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1.5x scale

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.