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Finding the Fourth Proportional to 715,954.34, 988,020.69 and 393,685.31

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Solution

The fourth proportional to 715,954.34, 988,020.69 and 393,685.31 is: 543,287.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,954.34 : 988,020.69 = 393,685.31 : x
  2. Step 2: Convert to fraction form
    715,954.34/988,020.69 = 393,685.31/x
  3. Step 3: Cross multiply
    715,954.34x = 988,020.69 × 393,685.31
  4. Step 4: Simplify right side
    715,954.34x = 388,969,232,622.80
  5. Step 5: Solve for x
    x = 388,969,232,622.80/715,954.34
  6. Step 6: Final answer
    x = 543,287.76

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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.