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Finding the Fourth Proportional to 518,418.45, 715,420.62 and 288,990.27

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Solution

The fourth proportional to 518,418.45, 715,420.62 and 288,990.27 is: 398,808.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,418.45 : 715,420.62 = 288,990.27 : x
  2. Step 2: Convert to fraction form
    518,418.45/715,420.62 = 288,990.27/x
  3. Step 3: Cross multiply
    518,418.45x = 715,420.62 × 288,990.27
  4. Step 4: Simplify right side
    518,418.45x = 206,749,598,137.37
  5. Step 5: Solve for x
    x = 206,749,598,137.37/518,418.45
  6. Step 6: Final answer
    x = 398,808.33

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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.