Home / 15,780.74-21,806.24-13,511.66

Finding the Fourth Proportional to 15,780.74, 21,806.24 and 13,511.66

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Solution

The fourth proportional to 15,780.74, 21,806.24 and 13,511.66 is: 18,670.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.74 : 21,806.24 = 13,511.66 : x
  2. Step 2: Convert to fraction form
    15,780.74/21,806.24 = 13,511.66/x
  3. Step 3: Cross multiply
    15,780.74x = 21,806.24 × 13,511.66
  4. Step 4: Simplify right side
    15,780.74x = 294,638,324.17
  5. Step 5: Solve for x
    x = 294,638,324.17/15,780.74
  6. Step 6: Final answer
    x = 18,670.76

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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.