Home / 39,780.59-54,897.21-21,876.80

Finding the Fourth Proportional to 39,780.59, 54,897.21 and 21,876.80

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Solution

The fourth proportional to 39,780.59, 54,897.21 and 21,876.80 is: 30,189.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780.59 : 54,897.21 = 21,876.80 : x
  2. Step 2: Convert to fraction form
    39,780.59/54,897.21 = 21,876.80/x
  3. Step 3: Cross multiply
    39,780.59x = 54,897.21 × 21,876.80
  4. Step 4: Simplify right side
    39,780.59x = 1,200,975,009.24
  5. Step 5: Solve for x
    x = 1,200,975,009.24/39,780.59
  6. Step 6: Final answer
    x = 30,189.98

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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.