Home / 21,420.52-31,949.64-20,185.70

Finding the Fourth Proportional to 21,420.52, 31,949.64 and 20,185.70

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Solution

The fourth proportional to 21,420.52, 31,949.64 and 20,185.70 is: 30,107.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.52 : 31,949.64 = 20,185.70 : x
  2. Step 2: Convert to fraction form
    21,420.52/31,949.64 = 20,185.70/x
  3. Step 3: Cross multiply
    21,420.52x = 31,949.64 × 20,185.70
  4. Step 4: Simplify right side
    21,420.52x = 644,925,848.15
  5. Step 5: Solve for x
    x = 644,925,848.15/21,420.52
  6. Step 6: Final answer
    x = 30,107.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.