Home / 20,880.09-31,315.28-9,776.21

Finding the Fourth Proportional to 20,880.09, 31,315.28 and 9,776.21

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Solution

The fourth proportional to 20,880.09, 31,315.28 and 9,776.21 is: 14,662.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.09 : 31,315.28 = 9,776.21 : x
  2. Step 2: Convert to fraction form
    20,880.09/31,315.28 = 9,776.21/x
  3. Step 3: Cross multiply
    20,880.09x = 31,315.28 × 9,776.21
  4. Step 4: Simplify right side
    20,880.09x = 306,144,548.03
  5. Step 5: Solve for x
    x = 306,144,548.03/20,880.09
  6. Step 6: Final answer
    x = 14,662.03

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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.