Home / 21,139.50-31,720.92-11,784.78

Finding the Fourth Proportional to 21,139.50, 31,720.92 and 11,784.78

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Solution

The fourth proportional to 21,139.50, 31,720.92 and 11,784.78 is: 17,683.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.50 : 31,720.92 = 11,784.78 : x
  2. Step 2: Convert to fraction form
    21,139.50/31,720.92 = 11,784.78/x
  3. Step 3: Cross multiply
    21,139.50x = 31,720.92 × 11,784.78
  4. Step 4: Simplify right side
    21,139.50x = 373,824,063.60
  5. Step 5: Solve for x
    x = 373,824,063.60/21,139.50
  6. Step 6: Final answer
    x = 17,683.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.