Home / 20,899.28-31,328.76-7,040.72

Finding the Fourth Proportional to 20,899.28, 31,328.76 and 7,040.72

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Solution

The fourth proportional to 20,899.28, 31,328.76 and 7,040.72 is: 10,554.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,899.28 : 31,328.76 = 7,040.72 : x
  2. Step 2: Convert to fraction form
    20,899.28/31,328.76 = 7,040.72/x
  3. Step 3: Cross multiply
    20,899.28x = 31,328.76 × 7,040.72
  4. Step 4: Simplify right side
    20,899.28x = 220,577,027.11
  5. Step 5: Solve for x
    x = 220,577,027.11/20,899.28
  6. Step 6: Final answer
    x = 10,554.29

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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.