Home / 21,139.88-29,172.74-12,187.40

Finding the Fourth Proportional to 21,139.88, 29,172.74 and 12,187.40

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Solution

The fourth proportional to 21,139.88, 29,172.74 and 12,187.40 is: 16,818.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.88 : 29,172.74 = 12,187.40 : x
  2. Step 2: Convert to fraction form
    21,139.88/29,172.74 = 12,187.40/x
  3. Step 3: Cross multiply
    21,139.88x = 29,172.74 × 12,187.40
  4. Step 4: Simplify right side
    21,139.88x = 355,539,851.48
  5. Step 5: Solve for x
    x = 355,539,851.48/21,139.88
  6. Step 6: Final answer
    x = 16,818.44

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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.