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Finding the Fourth Proportional to 678,735.84, 936,818.59 and 388,515.64

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Solution

The fourth proportional to 678,735.84, 936,818.59 and 388,515.64 is: 536,244.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,735.84 : 936,818.59 = 388,515.64 : x
  2. Step 2: Convert to fraction form
    678,735.84/936,818.59 = 388,515.64/x
  3. Step 3: Cross multiply
    678,735.84x = 936,818.59 × 388,515.64
  4. Step 4: Simplify right side
    678,735.84x = 363,968,674,057.75
  5. Step 5: Solve for x
    x = 363,968,674,057.75/678,735.84
  6. Step 6: Final answer
    x = 536,244.96

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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.