Home / 20,741.24-31,116.72-11,978.66

Finding the Fourth Proportional to 20,741.24, 31,116.72 and 11,978.66

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Solution

The fourth proportional to 20,741.24, 31,116.72 and 11,978.66 is: 17,970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,741.24 : 31,116.72 = 11,978.66 : x
  2. Step 2: Convert to fraction form
    20,741.24/31,116.72 = 11,978.66/x
  3. Step 3: Cross multiply
    20,741.24x = 31,116.72 × 11,978.66
  4. Step 4: Simplify right side
    20,741.24x = 372,736,609.20
  5. Step 5: Solve for x
    x = 372,736,609.20/20,741.24
  6. Step 6: Final answer
    x = 17,970.80

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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.