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Finding the Fourth Proportional to 715,938, 987,969.15 and 393,645.84

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Solution

The fourth proportional to 715,938, 987,969.15 and 393,645.84 is: 543,217.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,938 : 987,969.15 = 393,645.84 : x
  2. Step 2: Convert to fraction form
    715,938/987,969.15 = 393,645.84/x
  3. Step 3: Cross multiply
    715,938x = 987,969.15 × 393,645.84
  4. Step 4: Simplify right side
    715,938x = 388,909,945,945.84
  5. Step 5: Solve for x
    x = 388,909,945,945.84/715,938
  6. Step 6: Final answer
    x = 543,217.35

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1.5x scale

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.