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Finding the Fourth Proportional to 518,838.87, 715,995.79 and 289,395.98

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Solution

The fourth proportional to 518,838.87, 715,995.79 and 289,395.98 is: 399,365.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,838.87 : 715,995.79 = 289,395.98 : x
  2. Step 2: Convert to fraction form
    518,838.87/715,995.79 = 289,395.98/x
  3. Step 3: Cross multiply
    518,838.87x = 715,995.79 × 289,395.98
  4. Step 4: Simplify right side
    518,838.87x = 207,206,298,295.97
  5. Step 5: Solve for x
    x = 207,206,298,295.97/518,838.87
  6. Step 6: Final answer
    x = 399,365.41

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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.