Home / 21,000.45-31,500.68-18,540.08

Finding the Fourth Proportional to 21,000.45, 31,500.68 and 18,540.08

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Solution

The fourth proportional to 21,000.45, 31,500.68 and 18,540.08 is: 27,810.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.45 : 31,500.68 = 18,540.08 : x
  2. Step 2: Convert to fraction form
    21,000.45/31,500.68 = 18,540.08/x
  3. Step 3: Cross multiply
    21,000.45x = 31,500.68 × 18,540.08
  4. Step 4: Simplify right side
    21,000.45x = 584,024,877.05
  5. Step 5: Solve for x
    x = 584,024,877.05/21,000.45
  6. Step 6: Final answer
    x = 27,810.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.