Home / 20,999.70-31,513.95-9,321.30

Finding the Fourth Proportional to 20,999.70, 31,513.95 and 9,321.30

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Solution

The fourth proportional to 20,999.70, 31,513.95 and 9,321.30 is: 13,988.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.70 : 31,513.95 = 9,321.30 : x
  2. Step 2: Convert to fraction form
    20,999.70/31,513.95 = 9,321.30/x
  3. Step 3: Cross multiply
    20,999.70x = 31,513.95 × 9,321.30
  4. Step 4: Simplify right side
    20,999.70x = 293,750,982.14
  5. Step 5: Solve for x
    x = 293,750,982.14/20,999.70
  6. Step 6: Final answer
    x = 13,988.34

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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.