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Finding the Fourth Proportional to 715,696.40, 987,649.94 and 393,399.60

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Solution

The fourth proportional to 715,696.40, 987,649.94 and 393,399.60 is: 542,885.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,696.40 : 987,649.94 = 393,399.60 : x
  2. Step 2: Convert to fraction form
    715,696.40/987,649.94 = 393,399.60/x
  3. Step 3: Cross multiply
    715,696.40x = 987,649.94 × 393,399.60
  4. Step 4: Simplify right side
    715,696.40x = 388,541,091,336.02
  5. Step 5: Solve for x
    x = 388,541,091,336.02/715,696.40
  6. Step 6: Final answer
    x = 542,885.35

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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.