Home / 21,989.67-30,334.59-13,909.71

Finding the Fourth Proportional to 21,989.67, 30,334.59 and 13,909.71

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Solution

The fourth proportional to 21,989.67, 30,334.59 and 13,909.71 is: 19,188.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.67 : 30,334.59 = 13,909.71 : x
  2. Step 2: Convert to fraction form
    21,989.67/30,334.59 = 13,909.71/x
  3. Step 3: Cross multiply
    21,989.67x = 30,334.59 × 13,909.71
  4. Step 4: Simplify right side
    21,989.67x = 421,945,349.87
  5. Step 5: Solve for x
    x = 421,945,349.87/21,989.67
  6. Step 6: Final answer
    x = 19,188.34

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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.