Home / 20,672.40-28,529.88-11,720.32

Finding the Fourth Proportional to 20,672.40, 28,529.88 and 11,720.32

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Solution

The fourth proportional to 20,672.40, 28,529.88 and 11,720.32 is: 16,175.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.40 : 28,529.88 = 11,720.32 : x
  2. Step 2: Convert to fraction form
    20,672.40/28,529.88 = 11,720.32/x
  3. Step 3: Cross multiply
    20,672.40x = 28,529.88 × 11,720.32
  4. Step 4: Simplify right side
    20,672.40x = 334,379,323.16
  5. Step 5: Solve for x
    x = 334,379,323.16/20,672.40
  6. Step 6: Final answer
    x = 16,175.16

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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.