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Finding the Fourth Proportional to 660,535.05, 911,522.88 and 388,620.43

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Solution

The fourth proportional to 660,535.05, 911,522.88 and 388,620.43 is: 536,287.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,535.05 : 911,522.88 = 388,620.43 : x
  2. Step 2: Convert to fraction form
    660,535.05/911,522.88 = 388,620.43/x
  3. Step 3: Cross multiply
    660,535.05x = 911,522.88 × 388,620.43
  4. Step 4: Simplify right side
    660,535.05x = 354,236,413,580.44
  5. Step 5: Solve for x
    x = 354,236,413,580.44/660,535.05
  6. Step 6: Final answer
    x = 536,287.08

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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.