Home / 20,938.78-28,897.12-11,989.08

Finding the Fourth Proportional to 20,938.78, 28,897.12 and 11,989.08

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Solution

The fourth proportional to 20,938.78, 28,897.12 and 11,989.08 is: 16,545.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.78 : 28,897.12 = 11,989.08 : x
  2. Step 2: Convert to fraction form
    20,938.78/28,897.12 = 11,989.08/x
  3. Step 3: Cross multiply
    20,938.78x = 28,897.12 × 11,989.08
  4. Step 4: Simplify right side
    20,938.78x = 346,449,883.45
  5. Step 5: Solve for x
    x = 346,449,883.45/20,938.78
  6. Step 6: Final answer
    x = 16,545.85

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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.