Home / 21,579.84-29,778.15-15,917.67

Finding the Fourth Proportional to 21,579.84, 29,778.15 and 15,917.67

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Solution

The fourth proportional to 21,579.84, 29,778.15 and 15,917.67 is: 21,964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579.84 : 29,778.15 = 15,917.67 : x
  2. Step 2: Convert to fraction form
    21,579.84/29,778.15 = 15,917.67/x
  3. Step 3: Cross multiply
    21,579.84x = 29,778.15 × 15,917.67
  4. Step 4: Simplify right side
    21,579.84x = 473,998,764.91
  5. Step 5: Solve for x
    x = 473,998,764.91/21,579.84
  6. Step 6: Final answer
    x = 21,964.89

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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.