Home / 20,865.21-31,298.13-11,503.47

Finding the Fourth Proportional to 20,865.21, 31,298.13 and 11,503.47

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Solution

The fourth proportional to 20,865.21, 31,298.13 and 11,503.47 is: 17,255.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.21 : 31,298.13 = 11,503.47 : x
  2. Step 2: Convert to fraction form
    20,865.21/31,298.13 = 11,503.47/x
  3. Step 3: Cross multiply
    20,865.21x = 31,298.13 × 11,503.47
  4. Step 4: Simplify right side
    20,865.21x = 360,037,099.51
  5. Step 5: Solve for x
    x = 360,037,099.51/20,865.21
  6. Step 6: Final answer
    x = 17,255.38

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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.