Home / 20,991.90-31,451.40-17,711.40

Finding the Fourth Proportional to 20,991.90, 31,451.40 and 17,711.40

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Solution

The fourth proportional to 20,991.90, 31,451.40 and 17,711.40 is: 26,536.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.90 : 31,451.40 = 17,711.40 : x
  2. Step 2: Convert to fraction form
    20,991.90/31,451.40 = 17,711.40/x
  3. Step 3: Cross multiply
    20,991.90x = 31,451.40 × 17,711.40
  4. Step 4: Simplify right side
    20,991.90x = 557,048,325.96
  5. Step 5: Solve for x
    x = 557,048,325.96/20,991.90
  6. Step 6: Final answer
    x = 26,536.35

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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.