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Finding the Fourth Proportional to 715,821, 987,807.81 and 393,528.75

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Solution

The fourth proportional to 715,821, 987,807.81 and 393,528.75 is: 543,055.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,821 : 987,807.81 = 393,528.75 : x
  2. Step 2: Convert to fraction form
    715,821/987,807.81 = 393,528.75/x
  3. Step 3: Cross multiply
    715,821x = 987,807.81 × 393,528.75
  4. Step 4: Simplify right side
    715,821x = 388,730,772,709.54
  5. Step 5: Solve for x
    x = 388,730,772,709.54/715,821
  6. Step 6: Final answer
    x = 543,055.84

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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.