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Finding the Fourth Proportional to 715,855.14, 987,880.74 and 393,570.72

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Solution

The fourth proportional to 715,855.14, 987,880.74 and 393,570.72 is: 543,127.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,855.14 : 987,880.74 = 393,570.72 : x
  2. Step 2: Convert to fraction form
    715,855.14/987,880.74 = 393,570.72/x
  3. Step 3: Cross multiply
    715,855.14x = 987,880.74 × 393,570.72
  4. Step 4: Simplify right side
    715,855.14x = 388,800,934,115.93
  5. Step 5: Solve for x
    x = 388,800,934,115.93/715,855.14
  6. Step 6: Final answer
    x = 543,127.95

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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.