Home / 13,729.82-18,935.88-8,420.90

Finding the Fourth Proportional to 13,729.82, 18,935.88 and 8,420.90

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Solution

The fourth proportional to 13,729.82, 18,935.88 and 8,420.90 is: 11,613.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,729.82 : 18,935.88 = 8,420.90 : x
  2. Step 2: Convert to fraction form
    13,729.82/18,935.88 = 8,420.90/x
  3. Step 3: Cross multiply
    13,729.82x = 18,935.88 × 8,420.90
  4. Step 4: Simplify right side
    13,729.82x = 159,457,151.89
  5. Step 5: Solve for x
    x = 159,457,151.89/13,729.82
  6. Step 6: Final answer
    x = 11,613.93

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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.