Home / 15,385.88-21,221.97-9,420.49

Finding the Fourth Proportional to 15,385.88, 21,221.97 and 9,420.49

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Solution

The fourth proportional to 15,385.88, 21,221.97 and 9,420.49 is: 12,993.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.88 : 21,221.97 = 9,420.49 : x
  2. Step 2: Convert to fraction form
    15,385.88/21,221.97 = 9,420.49/x
  3. Step 3: Cross multiply
    15,385.88x = 21,221.97 × 9,420.49
  4. Step 4: Simplify right side
    15,385.88x = 199,921,382.69
  5. Step 5: Solve for x
    x = 199,921,382.69/15,385.88
  6. Step 6: Final answer
    x = 12,993.82

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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.