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Finding the Fourth Proportional to 21,645.34, 29,870.37 and 11,709.34

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Solution

The fourth proportional to 21,645.34, 29,870.37 and 11,709.34 is: 16,158.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,645.34 : 29,870.37 = 11,709.34 : x
  2. Step 2: Convert to fraction form
    21,645.34/29,870.37 = 11,709.34/x
  3. Step 3: Cross multiply
    21,645.34x = 29,870.37 × 11,709.34
  4. Step 4: Simplify right side
    21,645.34x = 349,762,318.26
  5. Step 5: Solve for x
    x = 349,762,318.26/21,645.34
  6. Step 6: Final answer
    x = 16,158.78

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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.