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Finding the Fourth Proportional to 21,042.80, 31,589.80 and 15,807.60

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Solution

The fourth proportional to 21,042.80, 31,589.80 and 15,807.60 is: 23,730.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,042.80 : 31,589.80 = 15,807.60 : x
  2. Step 2: Convert to fraction form
    21,042.80/31,589.80 = 15,807.60/x
  3. Step 3: Cross multiply
    21,042.80x = 31,589.80 × 15,807.60
  4. Step 4: Simplify right side
    21,042.80x = 499,358,922.48
  5. Step 5: Solve for x
    x = 499,358,922.48/21,042.80
  6. Step 6: Final answer
    x = 23,730.63

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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.