Home / 378,981.32-522,980.49-209,211.80

Finding the Fourth Proportional to 378,981.32, 522,980.49 and 209,211.80

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Solution

The fourth proportional to 378,981.32, 522,980.49 and 209,211.80 is: 288,704.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,981.32 : 522,980.49 = 209,211.80 : x
  2. Step 2: Convert to fraction form
    378,981.32/522,980.49 = 209,211.80/x
  3. Step 3: Cross multiply
    378,981.32x = 522,980.49 × 209,211.80
  4. Step 4: Simplify right side
    378,981.32x = 109,413,689,677.78
  5. Step 5: Solve for x
    x = 109,413,689,677.78/378,981.32
  6. Step 6: Final answer
    x = 288,704.70

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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.