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Finding the Fourth Proportional to 28,234.40, 42,400.20 and 19,972.40

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Solution

The fourth proportional to 28,234.40, 42,400.20 and 19,972.40 is: 29,992.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,234.40 : 42,400.20 = 19,972.40 : x
  2. Step 2: Convert to fraction form
    28,234.40/42,400.20 = 19,972.40/x
  3. Step 3: Cross multiply
    28,234.40x = 42,400.20 × 19,972.40
  4. Step 4: Simplify right side
    28,234.40x = 846,833,754.48
  5. Step 5: Solve for x
    x = 846,833,754.48/28,234.40
  6. Step 6: Final answer
    x = 29,992.98

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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.