Home / 15,385.85-21,221.91-9,420.47

Finding the Fourth Proportional to 15,385.85, 21,221.91 and 9,420.47

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Solution

The fourth proportional to 15,385.85, 21,221.91 and 9,420.47 is: 12,993.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.85 : 21,221.91 = 9,420.47 : x
  2. Step 2: Convert to fraction form
    15,385.85/21,221.91 = 9,420.47/x
  3. Step 3: Cross multiply
    15,385.85x = 21,221.91 × 9,420.47
  4. Step 4: Simplify right side
    15,385.85x = 199,920,260.39
  5. Step 5: Solve for x
    x = 199,920,260.39/15,385.85
  6. Step 6: Final answer
    x = 12,993.78

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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.