Home / 21,020.16-28,971.12-18,314.45

Finding the Fourth Proportional to 21,020.16, 28,971.12 and 18,314.45

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Solution

The fourth proportional to 21,020.16, 28,971.12 and 18,314.45 is: 25,241.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.16 : 28,971.12 = 18,314.45 : x
  2. Step 2: Convert to fraction form
    21,020.16/28,971.12 = 18,314.45/x
  3. Step 3: Cross multiply
    21,020.16x = 28,971.12 × 18,314.45
  4. Step 4: Simplify right side
    21,020.16x = 530,590,221.09
  5. Step 5: Solve for x
    x = 530,590,221.09/21,020.16
  6. Step 6: Final answer
    x = 25,241.97

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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.