Home / 20,988.78-28,972.11-13,917.54

Finding the Fourth Proportional to 20,988.78, 28,972.11 and 13,917.54

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Solution

The fourth proportional to 20,988.78, 28,972.11 and 13,917.54 is: 19,211.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.78 : 28,972.11 = 13,917.54 : x
  2. Step 2: Convert to fraction form
    20,988.78/28,972.11 = 13,917.54/x
  3. Step 3: Cross multiply
    20,988.78x = 28,972.11 × 13,917.54
  4. Step 4: Simplify right side
    20,988.78x = 403,220,499.81
  5. Step 5: Solve for x
    x = 403,220,499.81/20,988.78
  6. Step 6: Final answer
    x = 19,211.24

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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.