Home / 21,109.68-29,128.84-12,160.10

Finding the Fourth Proportional to 21,109.68, 29,128.84 and 12,160.10

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Solution

The fourth proportional to 21,109.68, 29,128.84 and 12,160.10 is: 16,779.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.68 : 29,128.84 = 12,160.10 : x
  2. Step 2: Convert to fraction form
    21,109.68/29,128.84 = 12,160.10/x
  3. Step 3: Cross multiply
    21,109.68x = 29,128.84 × 12,160.10
  4. Step 4: Simplify right side
    21,109.68x = 354,209,607.28
  5. Step 5: Solve for x
    x = 354,209,607.28/21,109.68
  6. Step 6: Final answer
    x = 16,779.49

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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.