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Finding the Fourth Proportional to 21,347.80, 31,948.80 and 18,723.40

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Solution

The fourth proportional to 21,347.80, 31,948.80 and 18,723.40 is: 28,021.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,347.80 : 31,948.80 = 18,723.40 : x
  2. Step 2: Convert to fraction form
    21,347.80/31,948.80 = 18,723.40/x
  3. Step 3: Cross multiply
    21,347.80x = 31,948.80 × 18,723.40
  4. Step 4: Simplify right side
    21,347.80x = 598,190,161.92
  5. Step 5: Solve for x
    x = 598,190,161.92/21,347.80
  6. Step 6: Final answer
    x = 28,021.16

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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.