Home / 20,690.89-28,549.64-13,518.90

Finding the Fourth Proportional to 20,690.89, 28,549.64 and 13,518.90

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Solution

The fourth proportional to 20,690.89, 28,549.64 and 13,518.90 is: 18,653.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.89 : 28,549.64 = 13,518.90 : x
  2. Step 2: Convert to fraction form
    20,690.89/28,549.64 = 13,518.90/x
  3. Step 3: Cross multiply
    20,690.89x = 28,549.64 × 13,518.90
  4. Step 4: Simplify right side
    20,690.89x = 385,959,728.20
  5. Step 5: Solve for x
    x = 385,959,728.20/20,690.89
  6. Step 6: Final answer
    x = 18,653.61

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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.