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Finding the Fourth Proportional to 259,715.40, 389,864.70 and 200,812.20

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Solution

The fourth proportional to 259,715.40, 389,864.70 and 200,812.20 is: 301,443.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,715.40 : 389,864.70 = 200,812.20 : x
  2. Step 2: Convert to fraction form
    259,715.40/389,864.70 = 200,812.20/x
  3. Step 3: Cross multiply
    259,715.40x = 389,864.70 × 200,812.20
  4. Step 4: Simplify right side
    259,715.40x = 78,289,588,109.34
  5. Step 5: Solve for x
    x = 78,289,588,109.34/259,715.40
  6. Step 6: Final answer
    x = 301,443.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.