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Finding the Fourth Proportional to 665,395.44, 918,313.32 and 393,551.32

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Solution

The fourth proportional to 665,395.44, 918,313.32 and 393,551.32 is: 543,140.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,395.44 : 918,313.32 = 393,551.32 : x
  2. Step 2: Convert to fraction form
    665,395.44/918,313.32 = 393,551.32/x
  3. Step 3: Cross multiply
    665,395.44x = 918,313.32 × 393,551.32
  4. Step 4: Simplify right side
    665,395.44x = 361,403,419,259.58
  5. Step 5: Solve for x
    x = 361,403,419,259.58/665,395.44
  6. Step 6: Final answer
    x = 543,140.81

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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.