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Finding the Fourth Proportional to 715,689.36, 987,645.50 and 393,396.03

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Solution

The fourth proportional to 715,689.36, 987,645.50 and 393,396.03 is: 542,883.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,689.36 : 987,645.50 = 393,396.03 : x
  2. Step 2: Convert to fraction form
    715,689.36/987,645.50 = 393,396.03/x
  3. Step 3: Cross multiply
    715,689.36x = 987,645.50 × 393,396.03
  4. Step 4: Simplify right side
    715,689.36x = 388,535,816,780.39
  5. Step 5: Solve for x
    x = 388,535,816,780.39/715,689.36
  6. Step 6: Final answer
    x = 542,883.32

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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.