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Finding the Fourth Proportional to 21,241.73, 31,801.02 and 18,990.47

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Solution

The fourth proportional to 21,241.73, 31,801.02 and 18,990.47 is: 28,430.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,241.73 : 31,801.02 = 18,990.47 : x
  2. Step 2: Convert to fraction form
    21,241.73/31,801.02 = 18,990.47/x
  3. Step 3: Cross multiply
    21,241.73x = 31,801.02 × 18,990.47
  4. Step 4: Simplify right side
    21,241.73x = 603,916,157.27
  5. Step 5: Solve for x
    x = 603,916,157.27/21,241.73
  6. Step 6: Final answer
    x = 28,430.66

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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.