Home / 16,987.78-25,485.40-7,121.98

Finding the Fourth Proportional to 16,987.78, 25,485.40 and 7,121.98

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Solution

The fourth proportional to 16,987.78, 25,485.40 and 7,121.98 is: 10,684.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,987.78 : 25,485.40 = 7,121.98 : x
  2. Step 2: Convert to fraction form
    16,987.78/25,485.40 = 7,121.98/x
  3. Step 3: Cross multiply
    16,987.78x = 25,485.40 × 7,121.98
  4. Step 4: Simplify right side
    16,987.78x = 181,506,509.09
  5. Step 5: Solve for x
    x = 181,506,509.09/16,987.78
  6. Step 6: Final answer
    x = 10,684.53

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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.