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Finding the Fourth Proportional to 715,824, 987,811.95 and 393,531.75

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Solution

The fourth proportional to 715,824, 987,811.95 and 393,531.75 is: 543,059.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,824 : 987,811.95 = 393,531.75 : x
  2. Step 2: Convert to fraction form
    715,824/987,811.95 = 393,531.75/x
  3. Step 3: Cross multiply
    715,824x = 987,811.95 × 393,531.75
  4. Step 4: Simplify right side
    715,824x = 388,735,365,354.41
  5. Step 5: Solve for x
    x = 388,735,365,354.41/715,824
  6. Step 6: Final answer
    x = 543,059.98

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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.