Home / 20,430.75-28,175.72-13,253.19

Finding the Fourth Proportional to 20,430.75, 28,175.72 and 13,253.19

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Solution

The fourth proportional to 20,430.75, 28,175.72 and 13,253.19 is: 18,277.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.75 : 28,175.72 = 13,253.19 : x
  2. Step 2: Convert to fraction form
    20,430.75/28,175.72 = 13,253.19/x
  3. Step 3: Cross multiply
    20,430.75x = 28,175.72 × 13,253.19
  4. Step 4: Simplify right side
    20,430.75x = 373,418,104.28
  5. Step 5: Solve for x
    x = 373,418,104.28/20,430.75
  6. Step 6: Final answer
    x = 18,277.26

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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.