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Finding the Fourth Proportional to 711,395.90, 981,749.67 and 389,105.98

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Solution

The fourth proportional to 711,395.90, 981,749.67 and 389,105.98 is: 536,979.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,395.90 : 981,749.67 = 389,105.98 : x
  2. Step 2: Convert to fraction form
    711,395.90/981,749.67 = 389,105.98/x
  3. Step 3: Cross multiply
    711,395.90x = 981,749.67 × 389,105.98
  4. Step 4: Simplify right side
    711,395.90x = 382,004,663,546.51
  5. Step 5: Solve for x
    x = 382,004,663,546.51/711,395.90
  6. Step 6: Final answer
    x = 536,979.01

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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.