Home / 1,685.86-2,519.08-1,288.36

Finding the Fourth Proportional to 1,685.86, 2,519.08 and 1,288.36

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Solution

The fourth proportional to 1,685.86, 2,519.08 and 1,288.36 is: 1,925.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.86 : 2,519.08 = 1,288.36 : x
  2. Step 2: Convert to fraction form
    1,685.86/2,519.08 = 1,288.36/x
  3. Step 3: Cross multiply
    1,685.86x = 2,519.08 × 1,288.36
  4. Step 4: Simplify right side
    1,685.86x = 3,245,481.91
  5. Step 5: Solve for x
    x = 3,245,481.91/1,685.86
  6. Step 6: Final answer
    x = 1,925.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.