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Finding the Fourth Proportional to 21,379.42, 29,503.11 and 11,948.86

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Solution

The fourth proportional to 21,379.42, 29,503.11 and 11,948.86 is: 16,489.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.42 : 29,503.11 = 11,948.86 : x
  2. Step 2: Convert to fraction form
    21,379.42/29,503.11 = 11,948.86/x
  3. Step 3: Cross multiply
    21,379.42x = 29,503.11 × 11,948.86
  4. Step 4: Simplify right side
    21,379.42x = 352,528,530.95
  5. Step 5: Solve for x
    x = 352,528,530.95/21,379.42
  6. Step 6: Final answer
    x = 16,489.15

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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.