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Finding the Fourth Proportional to 665,396.44, 918,314.70 and 393,552.32

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Solution

The fourth proportional to 665,396.44, 918,314.70 and 393,552.32 is: 543,142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,396.44 : 918,314.70 = 393,552.32 : x
  2. Step 2: Convert to fraction form
    665,396.44/918,314.70 = 393,552.32/x
  3. Step 3: Cross multiply
    665,396.44x = 918,314.70 × 393,552.32
  4. Step 4: Simplify right side
    665,396.44x = 361,404,880,675.10
  5. Step 5: Solve for x
    x = 361,404,880,675.10/665,396.44
  6. Step 6: Final answer
    x = 543,142.19

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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.