Home / 20,319.72-28,039.90-11,365.68

Finding the Fourth Proportional to 20,319.72, 28,039.90 and 11,365.68

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Solution

The fourth proportional to 20,319.72, 28,039.90 and 11,365.68 is: 15,683.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,319.72 : 28,039.90 = 11,365.68 : x
  2. Step 2: Convert to fraction form
    20,319.72/28,039.90 = 11,365.68/x
  3. Step 3: Cross multiply
    20,319.72x = 28,039.90 × 11,365.68
  4. Step 4: Simplify right side
    20,319.72x = 318,692,530.63
  5. Step 5: Solve for x
    x = 318,692,530.63/20,319.72
  6. Step 6: Final answer
    x = 15,683.90

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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.