Home / 21,011.20-28,994.74-11,579.76

Finding the Fourth Proportional to 21,011.20, 28,994.74 and 11,579.76

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Solution

The fourth proportional to 21,011.20, 28,994.74 and 11,579.76 is: 15,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.20 : 28,994.74 = 11,579.76 : x
  2. Step 2: Convert to fraction form
    21,011.20/28,994.74 = 11,579.76/x
  3. Step 3: Cross multiply
    21,011.20x = 28,994.74 × 11,579.76
  4. Step 4: Simplify right side
    21,011.20x = 335,752,130.46
  5. Step 5: Solve for x
    x = 335,752,130.46/21,011.20
  6. Step 6: Final answer
    x = 15,979.67

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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.