Home / 257,815.80-387,015.30-139,426.20

Finding the Fourth Proportional to 257,815.80, 387,015.30 and 139,426.20

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Solution

The fourth proportional to 257,815.80, 387,015.30 and 139,426.20 is: 209,297.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,815.80 : 387,015.30 = 139,426.20 : x
  2. Step 2: Convert to fraction form
    257,815.80/387,015.30 = 139,426.20/x
  3. Step 3: Cross multiply
    257,815.80x = 387,015.30 × 139,426.20
  4. Step 4: Simplify right side
    257,815.80x = 53,960,072,620.86
  5. Step 5: Solve for x
    x = 53,960,072,620.86/257,815.80
  6. Step 6: Final answer
    x = 209,297.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.