Home / 21,869.50-30,175.05-12,917.38

Finding the Fourth Proportional to 21,869.50, 30,175.05 and 12,917.38

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Solution

The fourth proportional to 21,869.50, 30,175.05 and 12,917.38 is: 17,823.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.50 : 30,175.05 = 12,917.38 : x
  2. Step 2: Convert to fraction form
    21,869.50/30,175.05 = 12,917.38/x
  3. Step 3: Cross multiply
    21,869.50x = 30,175.05 × 12,917.38
  4. Step 4: Simplify right side
    21,869.50x = 389,782,587.37
  5. Step 5: Solve for x
    x = 389,782,587.37/21,869.50
  6. Step 6: Final answer
    x = 17,823.11

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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.