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Finding the Fourth Proportional to 3,992.84, 5,509.86 and 2,421.80

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Solution

The fourth proportional to 3,992.84, 5,509.86 and 2,421.80 is: 3,341.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992.84 : 5,509.86 = 2,421.80 : x
  2. Step 2: Convert to fraction form
    3,992.84/5,509.86 = 2,421.80/x
  3. Step 3: Cross multiply
    3,992.84x = 5,509.86 × 2,421.80
  4. Step 4: Simplify right side
    3,992.84x = 13,343,778.95
  5. Step 5: Solve for x
    x = 13,343,778.95/3,992.84
  6. Step 6: Final answer
    x = 3,341.93

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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.