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Finding the Fourth Proportional to 21,990.76, 30,352.53 and 12,564.79

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Solution

The fourth proportional to 21,990.76, 30,352.53 and 12,564.79 is: 17,342.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.76 : 30,352.53 = 12,564.79 : x
  2. Step 2: Convert to fraction form
    21,990.76/30,352.53 = 12,564.79/x
  3. Step 3: Cross multiply
    21,990.76x = 30,352.53 × 12,564.79
  4. Step 4: Simplify right side
    21,990.76x = 381,373,165.42
  5. Step 5: Solve for x
    x = 381,373,165.42/21,990.76
  6. Step 6: Final answer
    x = 17,342.43

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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.