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Finding the Fourth Proportional to 643,409.83, 888,012.01 and 357,022.18

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Solution

The fourth proportional to 643,409.83, 888,012.01 and 357,022.18 is: 492,749.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,409.83 : 888,012.01 = 357,022.18 : x
  2. Step 2: Convert to fraction form
    643,409.83/888,012.01 = 357,022.18/x
  3. Step 3: Cross multiply
    643,409.83x = 888,012.01 × 357,022.18
  4. Step 4: Simplify right side
    643,409.83x = 317,039,981,891.27
  5. Step 5: Solve for x
    x = 317,039,981,891.27/643,409.83
  6. Step 6: Final answer
    x = 492,749.67

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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.