Home / 15,115.48-20,804.31-13,311.15

Finding the Fourth Proportional to 15,115.48, 20,804.31 and 13,311.15

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Solution

The fourth proportional to 15,115.48, 20,804.31 and 13,311.15 is: 18,320.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.48 : 20,804.31 = 13,311.15 : x
  2. Step 2: Convert to fraction form
    15,115.48/20,804.31 = 13,311.15/x
  3. Step 3: Cross multiply
    15,115.48x = 20,804.31 × 13,311.15
  4. Step 4: Simplify right side
    15,115.48x = 276,929,330.06
  5. Step 5: Solve for x
    x = 276,929,330.06/15,115.48
  6. Step 6: Final answer
    x = 18,320.90

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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.