Home / 21,164.40-31,756.32-20,814.48

Finding the Fourth Proportional to 21,164.40, 31,756.32 and 20,814.48

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Solution

The fourth proportional to 21,164.40, 31,756.32 and 20,814.48 is: 31,231.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,164.40 : 31,756.32 = 20,814.48 : x
  2. Step 2: Convert to fraction form
    21,164.40/31,756.32 = 20,814.48/x
  3. Step 3: Cross multiply
    21,164.40x = 31,756.32 × 20,814.48
  4. Step 4: Simplify right side
    21,164.40x = 660,991,287.51
  5. Step 5: Solve for x
    x = 660,991,287.51/21,164.40
  6. Step 6: Final answer
    x = 31,231.28

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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.