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Finding the Fourth Proportional to 13,987.96, 20,981.94 and 5,103.94

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Solution

The fourth proportional to 13,987.96, 20,981.94 and 5,103.94 is: 7,655.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,987.96 : 20,981.94 = 5,103.94 : x
  2. Step 2: Convert to fraction form
    13,987.96/20,981.94 = 5,103.94/x
  3. Step 3: Cross multiply
    13,987.96x = 20,981.94 × 5,103.94
  4. Step 4: Simplify right side
    13,987.96x = 107,090,562.84
  5. Step 5: Solve for x
    x = 107,090,562.84/13,987.96
  6. Step 6: Final answer
    x = 7,655.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.