Home / 39,780.98-54,899.16-21,877.34

Finding the Fourth Proportional to 39,780.98, 54,899.16 and 21,877.34

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Solution

The fourth proportional to 39,780.98, 54,899.16 and 21,877.34 is: 30,191.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780.98 : 54,899.16 = 21,877.34 : x
  2. Step 2: Convert to fraction form
    39,780.98/54,899.16 = 21,877.34/x
  3. Step 3: Cross multiply
    39,780.98x = 54,899.16 × 21,877.34
  4. Step 4: Simplify right side
    39,780.98x = 1,201,047,589.03
  5. Step 5: Solve for x
    x = 1,201,047,589.03/39,780.98
  6. Step 6: Final answer
    x = 30,191.50

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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.