Home / 21,991.26-30,330.99-15,276.78

Finding the Fourth Proportional to 21,991.26, 30,330.99 and 15,276.78

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Solution

The fourth proportional to 21,991.26, 30,330.99 and 15,276.78 is: 21,070.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.26 : 30,330.99 = 15,276.78 : x
  2. Step 2: Convert to fraction form
    21,991.26/30,330.99 = 15,276.78/x
  3. Step 3: Cross multiply
    21,991.26x = 30,330.99 × 15,276.78
  4. Step 4: Simplify right side
    21,991.26x = 463,359,861.41
  5. Step 5: Solve for x
    x = 463,359,861.41/21,991.26
  6. Step 6: Final answer
    x = 21,070.18

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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.