Home / 15,395.78-21,245.37-8,681.42

Finding the Fourth Proportional to 15,395.78, 21,245.37 and 8,681.42

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Solution

The fourth proportional to 15,395.78, 21,245.37 and 8,681.42 is: 11,979.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,395.78 : 21,245.37 = 8,681.42 : x
  2. Step 2: Convert to fraction form
    15,395.78/21,245.37 = 8,681.42/x
  3. Step 3: Cross multiply
    15,395.78x = 21,245.37 × 8,681.42
  4. Step 4: Simplify right side
    15,395.78x = 184,439,980.03
  5. Step 5: Solve for x
    x = 184,439,980.03/15,395.78
  6. Step 6: Final answer
    x = 11,979.90

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1.5x scale

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.