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Finding the Fourth Proportional to 1,223,355.03, 1,688,843.56 and 764,724.73

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Solution

The fourth proportional to 1,223,355.03, 1,688,843.56 and 764,724.73 is: 1,055,703.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223,355.03 : 1,688,843.56 = 764,724.73 : x
  2. Step 2: Convert to fraction form
    1,223,355.03/1,688,843.56 = 764,724.73/x
  3. Step 3: Cross multiply
    1,223,355.03x = 1,688,843.56 × 764,724.73
  4. Step 4: Simplify right side
    1,223,355.03x = 1,291,500,429,299.32
  5. Step 5: Solve for x
    x = 1,291,500,429,299.32/1,223,355.03
  6. Step 6: Final answer
    x = 1,055,703.70

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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.