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Finding the Fourth Proportional to 711,403.59, 981,729.81 and 389,119.98

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Solution

The fourth proportional to 711,403.59, 981,729.81 and 389,119.98 is: 536,981.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,403.59 : 981,729.81 = 389,119.98 : x
  2. Step 2: Convert to fraction form
    711,403.59/981,729.81 = 389,119.98/x
  3. Step 3: Cross multiply
    711,403.59x = 981,729.81 × 389,119.98
  4. Step 4: Simplify right side
    711,403.59x = 382,010,684,032.60
  5. Step 5: Solve for x
    x = 382,010,684,032.60/711,403.59
  6. Step 6: Final answer
    x = 536,981.66

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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.