Home / 20,839.78-31,259.67-9,153.30

Finding the Fourth Proportional to 20,839.78, 31,259.67 and 9,153.30

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Solution

The fourth proportional to 20,839.78, 31,259.67 and 9,153.30 is: 13,729.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.78 : 31,259.67 = 9,153.30 : x
  2. Step 2: Convert to fraction form
    20,839.78/31,259.67 = 9,153.30/x
  3. Step 3: Cross multiply
    20,839.78x = 31,259.67 × 9,153.30
  4. Step 4: Simplify right side
    20,839.78x = 286,129,271.80
  5. Step 5: Solve for x
    x = 286,129,271.80/20,839.78
  6. Step 6: Final answer
    x = 13,729.96

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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.