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Finding the Fourth Proportional to 918,722.70, 1,378,268 and 514,489.77

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Solution

The fourth proportional to 918,722.70, 1,378,268 and 514,489.77 is: 771,837.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,722.70 : 1,378,268 = 514,489.77 : x
  2. Step 2: Convert to fraction form
    918,722.70/1,378,268 = 514,489.77/x
  3. Step 3: Cross multiply
    918,722.70x = 1,378,268 × 514,489.77
  4. Step 4: Simplify right side
    918,722.70x = 709,104,786,318.36
  5. Step 5: Solve for x
    x = 709,104,786,318.36/918,722.70
  6. Step 6: Final answer
    x = 771,837.67

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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.