Home / 20,985.20-31,444.20-11,111.60

Finding the Fourth Proportional to 20,985.20, 31,444.20 and 11,111.60

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Solution

The fourth proportional to 20,985.20, 31,444.20 and 11,111.60 is: 16,649.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.20 : 31,444.20 = 11,111.60 : x
  2. Step 2: Convert to fraction form
    20,985.20/31,444.20 = 11,111.60/x
  3. Step 3: Cross multiply
    20,985.20x = 31,444.20 × 11,111.60
  4. Step 4: Simplify right side
    20,985.20x = 349,395,372.72
  5. Step 5: Solve for x
    x = 349,395,372.72/20,985.20
  6. Step 6: Final answer
    x = 16,649.61

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1.5x scale

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.