Home / 21,984.72-30,340.40-12,421.29

Finding the Fourth Proportional to 21,984.72, 30,340.40 and 12,421.29

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Solution

The fourth proportional to 21,984.72, 30,340.40 and 12,421.29 is: 17,142.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,984.72 : 30,340.40 = 12,421.29 : x
  2. Step 2: Convert to fraction form
    21,984.72/30,340.40 = 12,421.29/x
  3. Step 3: Cross multiply
    21,984.72x = 30,340.40 × 12,421.29
  4. Step 4: Simplify right side
    21,984.72x = 376,866,907.12
  5. Step 5: Solve for x
    x = 376,866,907.12/21,984.72
  6. Step 6: Final answer
    x = 17,142.22

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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.