Home / 21,012.67-28,995.78-11,581.30

Finding the Fourth Proportional to 21,012.67, 28,995.78 and 11,581.30

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Solution

The fourth proportional to 21,012.67, 28,995.78 and 11,581.30 is: 15,981.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.67 : 28,995.78 = 11,581.30 : x
  2. Step 2: Convert to fraction form
    21,012.67/28,995.78 = 11,581.30/x
  3. Step 3: Cross multiply
    21,012.67x = 28,995.78 × 11,581.30
  4. Step 4: Simplify right side
    21,012.67x = 335,808,826.91
  5. Step 5: Solve for x
    x = 335,808,826.91/21,012.67
  6. Step 6: Final answer
    x = 15,981.25

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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.