Home / 21,111.28-29,128.74-12,157.13

Finding the Fourth Proportional to 21,111.28, 29,128.74 and 12,157.13

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Solution

The fourth proportional to 21,111.28, 29,128.74 and 12,157.13 is: 16,774.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.28 : 29,128.74 = 12,157.13 : x
  2. Step 2: Convert to fraction form
    21,111.28/29,128.74 = 12,157.13/x
  3. Step 3: Cross multiply
    21,111.28x = 29,128.74 × 12,157.13
  4. Step 4: Simplify right side
    21,111.28x = 354,121,878.92
  5. Step 5: Solve for x
    x = 354,121,878.92/21,111.28
  6. Step 6: Final answer
    x = 16,774.06

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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.