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Finding the Fourth Proportional to 715,661.88, 987,615.90 and 393,399.96

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Solution

The fourth proportional to 715,661.88, 987,615.90 and 393,399.96 is: 542,893.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,661.88 : 987,615.90 = 393,399.96 : x
  2. Step 2: Convert to fraction form
    715,661.88/987,615.90 = 393,399.96/x
  3. Step 3: Cross multiply
    715,661.88x = 987,615.90 × 393,399.96
  4. Step 4: Simplify right side
    715,661.88x = 388,528,055,555.36
  5. Step 5: Solve for x
    x = 388,528,055,555.36/715,661.88
  6. Step 6: Final answer
    x = 542,893.32

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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.