Home / 20,878.19-28,812-12,494.69

Finding the Fourth Proportional to 20,878.19, 28,812 and 12,494.69

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Solution

The fourth proportional to 20,878.19, 28,812 and 12,494.69 is: 17,242.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.19 : 28,812 = 12,494.69 : x
  2. Step 2: Convert to fraction form
    20,878.19/28,812 = 12,494.69/x
  3. Step 3: Cross multiply
    20,878.19x = 28,812 × 12,494.69
  4. Step 4: Simplify right side
    20,878.19x = 359,997,008.28
  5. Step 5: Solve for x
    x = 359,997,008.28/20,878.19
  6. Step 6: Final answer
    x = 17,242.73

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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.