Home / 21,258.99-31,883.91-8,775.78

Finding the Fourth Proportional to 21,258.99, 31,883.91 and 8,775.78

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Solution

The fourth proportional to 21,258.99, 31,883.91 and 8,775.78 is: 13,161.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,258.99 : 31,883.91 = 8,775.78 : x
  2. Step 2: Convert to fraction form
    21,258.99/31,883.91 = 8,775.78/x
  3. Step 3: Cross multiply
    21,258.99x = 31,883.91 × 8,775.78
  4. Step 4: Simplify right side
    21,258.99x = 279,806,179.70
  5. Step 5: Solve for x
    x = 279,806,179.70/21,258.99
  6. Step 6: Final answer
    x = 13,161.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.