Home / 21,109.07-29,127.96-12,159.47

Finding the Fourth Proportional to 21,109.07, 29,127.96 and 12,159.47

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Solution

The fourth proportional to 21,109.07, 29,127.96 and 12,159.47 is: 16,778.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.07 : 29,127.96 = 12,159.47 : x
  2. Step 2: Convert to fraction form
    21,109.07/29,127.96 = 12,159.47/x
  3. Step 3: Cross multiply
    21,109.07x = 29,127.96 × 12,159.47
  4. Step 4: Simplify right side
    21,109.07x = 354,180,555.78
  5. Step 5: Solve for x
    x = 354,180,555.78/21,109.07
  6. Step 6: Final answer
    x = 16,778.60

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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.