Home / 21,279.87-31,918.61-9,430.23

Finding the Fourth Proportional to 21,279.87, 31,918.61 and 9,430.23

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Solution

The fourth proportional to 21,279.87, 31,918.61 and 9,430.23 is: 14,144.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.87 : 31,918.61 = 9,430.23 : x
  2. Step 2: Convert to fraction form
    21,279.87/31,918.61 = 9,430.23/x
  3. Step 3: Cross multiply
    21,279.87x = 31,918.61 × 9,430.23
  4. Step 4: Simplify right side
    21,279.87x = 300,999,786.43
  5. Step 5: Solve for x
    x = 300,999,786.43/21,279.87
  6. Step 6: Final answer
    x = 14,144.81

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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.