Home / 20,840.56-28,752.21-13,285.15

Finding the Fourth Proportional to 20,840.56, 28,752.21 and 13,285.15

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Solution

The fourth proportional to 20,840.56, 28,752.21 and 13,285.15 is: 18,328.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.56 : 28,752.21 = 13,285.15 : x
  2. Step 2: Convert to fraction form
    20,840.56/28,752.21 = 13,285.15/x
  3. Step 3: Cross multiply
    20,840.56x = 28,752.21 × 13,285.15
  4. Step 4: Simplify right side
    20,840.56x = 381,977,422.68
  5. Step 5: Solve for x
    x = 381,977,422.68/20,840.56
  6. Step 6: Final answer
    x = 18,328.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.