Home / 20,938.48-28,887.12-15,500.50

Finding the Fourth Proportional to 20,938.48, 28,887.12 and 15,500.50

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Solution

The fourth proportional to 20,938.48, 28,887.12 and 15,500.50 is: 21,384.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.48 : 28,887.12 = 15,500.50 : x
  2. Step 2: Convert to fraction form
    20,938.48/28,887.12 = 15,500.50/x
  3. Step 3: Cross multiply
    20,938.48x = 28,887.12 × 15,500.50
  4. Step 4: Simplify right side
    20,938.48x = 447,764,731.34
  5. Step 5: Solve for x
    x = 447,764,731.34/20,938.48
  6. Step 6: Final answer
    x = 21,384.78

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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.