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Finding the Fourth Proportional to 711,208.57, 981,467.40 and 388,918.67

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Solution

The fourth proportional to 711,208.57, 981,467.40 and 388,918.67 is: 536,707.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,208.57 : 981,467.40 = 388,918.67 : x
  2. Step 2: Convert to fraction form
    711,208.57/981,467.40 = 388,918.67/x
  3. Step 3: Cross multiply
    711,208.57x = 981,467.40 × 388,918.67
  4. Step 4: Simplify right side
    711,208.57x = 381,710,995,856.36
  5. Step 5: Solve for x
    x = 381,710,995,856.36/711,208.57
  6. Step 6: Final answer
    x = 536,707.53

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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.