Home / 12,655.86-18,985.60-3,891.51

Finding the Fourth Proportional to 12,655.86, 18,985.60 and 3,891.51

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Solution

The fourth proportional to 12,655.86, 18,985.60 and 3,891.51 is: 5,837.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.86 : 18,985.60 = 3,891.51 : x
  2. Step 2: Convert to fraction form
    12,655.86/18,985.60 = 3,891.51/x
  3. Step 3: Cross multiply
    12,655.86x = 18,985.60 × 3,891.51
  4. Step 4: Simplify right side
    12,655.86x = 73,882,557.33
  5. Step 5: Solve for x
    x = 73,882,557.33/12,655.86
  6. Step 6: Final answer
    x = 5,837.82

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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.