Home / 21,741.40-30,003.78-13,781.80

Finding the Fourth Proportional to 21,741.40, 30,003.78 and 13,781.80

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Solution

The fourth proportional to 21,741.40, 30,003.78 and 13,781.80 is: 19,019.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,741.40 : 30,003.78 = 13,781.80 : x
  2. Step 2: Convert to fraction form
    21,741.40/30,003.78 = 13,781.80/x
  3. Step 3: Cross multiply
    21,741.40x = 30,003.78 × 13,781.80
  4. Step 4: Simplify right side
    21,741.40x = 413,506,095.20
  5. Step 5: Solve for x
    x = 413,506,095.20/21,741.40
  6. Step 6: Final answer
    x = 19,019.29

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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.