Home / 21,012.81-28,998.98-11,581.35

Finding the Fourth Proportional to 21,012.81, 28,998.98 and 11,581.35

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Solution

The fourth proportional to 21,012.81, 28,998.98 and 11,581.35 is: 15,982.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.81 : 28,998.98 = 11,581.35 : x
  2. Step 2: Convert to fraction form
    21,012.81/28,998.98 = 11,581.35/x
  3. Step 3: Cross multiply
    21,012.81x = 28,998.98 × 11,581.35
  4. Step 4: Simplify right side
    21,012.81x = 335,847,279.12
  5. Step 5: Solve for x
    x = 335,847,279.12/21,012.81
  6. Step 6: Final answer
    x = 15,982.98

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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.