Home / 20,690.71-28,548.85-13,531.12

Finding the Fourth Proportional to 20,690.71, 28,548.85 and 13,531.12

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Solution

The fourth proportional to 20,690.71, 28,548.85 and 13,531.12 is: 18,670.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.71 : 28,548.85 = 13,531.12 : x
  2. Step 2: Convert to fraction form
    20,690.71/28,548.85 = 13,531.12/x
  3. Step 3: Cross multiply
    20,690.71x = 28,548.85 × 13,531.12
  4. Step 4: Simplify right side
    20,690.71x = 386,297,810.01
  5. Step 5: Solve for x
    x = 386,297,810.01/20,690.71
  6. Step 6: Final answer
    x = 18,670.11

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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.