Home / 28,456.22-39,271.30-15,881.78

Finding the Fourth Proportional to 28,456.22, 39,271.30 and 15,881.78

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Solution

The fourth proportional to 28,456.22, 39,271.30 and 15,881.78 is: 21,917.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.22 : 39,271.30 = 15,881.78 : x
  2. Step 2: Convert to fraction form
    28,456.22/39,271.30 = 15,881.78/x
  3. Step 3: Cross multiply
    28,456.22x = 39,271.30 × 15,881.78
  4. Step 4: Simplify right side
    28,456.22x = 623,698,146.91
  5. Step 5: Solve for x
    x = 623,698,146.91/28,456.22
  6. Step 6: Final answer
    x = 21,917.81

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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.