Home / 21,272.14-29,355.14-13,318.75

Finding the Fourth Proportional to 21,272.14, 29,355.14 and 13,318.75

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Solution

The fourth proportional to 21,272.14, 29,355.14 and 13,318.75 is: 18,379.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.14 : 29,355.14 = 13,318.75 : x
  2. Step 2: Convert to fraction form
    21,272.14/29,355.14 = 13,318.75/x
  3. Step 3: Cross multiply
    21,272.14x = 29,355.14 × 13,318.75
  4. Step 4: Simplify right side
    21,272.14x = 390,973,770.88
  5. Step 5: Solve for x
    x = 390,973,770.88/21,272.14
  6. Step 6: Final answer
    x = 18,379.62

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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.