Home / 20,457.91-28,222.38-13,287.32

Finding the Fourth Proportional to 20,457.91, 28,222.38 and 13,287.32

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Solution

The fourth proportional to 20,457.91, 28,222.38 and 13,287.32 is: 18,330.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,457.91 : 28,222.38 = 13,287.32 : x
  2. Step 2: Convert to fraction form
    20,457.91/28,222.38 = 13,287.32/x
  3. Step 3: Cross multiply
    20,457.91x = 28,222.38 × 13,287.32
  4. Step 4: Simplify right side
    20,457.91x = 374,999,653.11
  5. Step 5: Solve for x
    x = 374,999,653.11/20,457.91
  6. Step 6: Final answer
    x = 18,330.30

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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.