Home / 39,720.50-54,814.67-21,815.88

Finding the Fourth Proportional to 39,720.50, 54,814.67 and 21,815.88

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Solution

The fourth proportional to 39,720.50, 54,814.67 and 21,815.88 is: 30,106.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.50 : 54,814.67 = 21,815.88 : x
  2. Step 2: Convert to fraction form
    39,720.50/54,814.67 = 21,815.88/x
  3. Step 3: Cross multiply
    39,720.50x = 54,814.67 × 21,815.88
  4. Step 4: Simplify right side
    39,720.50x = 1,195,830,262.96
  5. Step 5: Solve for x
    x = 1,195,830,262.96/39,720.50
  6. Step 6: Final answer
    x = 30,106.12

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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.