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Finding the Fourth Proportional to 30,310.71, 45,489.80 and 21,015.96

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Solution

The fourth proportional to 30,310.71, 45,489.80 and 21,015.96 is: 31,540.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,310.71 : 45,489.80 = 21,015.96 : x
  2. Step 2: Convert to fraction form
    30,310.71/45,489.80 = 21,015.96/x
  3. Step 3: Cross multiply
    30,310.71x = 45,489.80 × 21,015.96
  4. Step 4: Simplify right side
    30,310.71x = 956,011,699.16
  5. Step 5: Solve for x
    x = 956,011,699.16/30,310.71
  6. Step 6: Final answer
    x = 31,540.40

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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.