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Finding the Fourth Proportional to 21,990.96, 30,347.86 and 12,559.54

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Solution

The fourth proportional to 21,990.96, 30,347.86 and 12,559.54 is: 17,332.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.96 : 30,347.86 = 12,559.54 : x
  2. Step 2: Convert to fraction form
    21,990.96/30,347.86 = 12,559.54/x
  3. Step 3: Cross multiply
    21,990.96x = 30,347.86 × 12,559.54
  4. Step 4: Simplify right side
    21,990.96x = 381,155,161.58
  5. Step 5: Solve for x
    x = 381,155,161.58/21,990.96
  6. Step 6: Final answer
    x = 17,332.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.