Home / 21,255.81-31,856.01-13,247.28

Finding the Fourth Proportional to 21,255.81, 31,856.01 and 13,247.28

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Solution

The fourth proportional to 21,255.81, 31,856.01 and 13,247.28 is: 19,853.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,255.81 : 31,856.01 = 13,247.28 : x
  2. Step 2: Convert to fraction form
    21,255.81/31,856.01 = 13,247.28/x
  3. Step 3: Cross multiply
    21,255.81x = 31,856.01 × 13,247.28
  4. Step 4: Simplify right side
    21,255.81x = 422,005,484.15
  5. Step 5: Solve for x
    x = 422,005,484.15/21,255.81
  6. Step 6: Final answer
    x = 19,853.65

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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.