Home / 20,681.80-31,022.70-18,385.45

Finding the Fourth Proportional to 20,681.80, 31,022.70 and 18,385.45

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Solution

The fourth proportional to 20,681.80, 31,022.70 and 18,385.45 is: 27,578.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.80 : 31,022.70 = 18,385.45 : x
  2. Step 2: Convert to fraction form
    20,681.80/31,022.70 = 18,385.45/x
  3. Step 3: Cross multiply
    20,681.80x = 31,022.70 × 18,385.45
  4. Step 4: Simplify right side
    20,681.80x = 570,366,299.72
  5. Step 5: Solve for x
    x = 570,366,299.72/20,681.80
  6. Step 6: Final answer
    x = 27,578.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.