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Finding the Fourth Proportional to 20,332.88, 30,441.80 and 12,918.96

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Solution

The fourth proportional to 20,332.88, 30,441.80 and 12,918.96 is: 19,341.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,332.88 : 30,441.80 = 12,918.96 : x
  2. Step 2: Convert to fraction form
    20,332.88/30,441.80 = 12,918.96/x
  3. Step 3: Cross multiply
    20,332.88x = 30,441.80 × 12,918.96
  4. Step 4: Simplify right side
    20,332.88x = 393,276,396.53
  5. Step 5: Solve for x
    x = 393,276,396.53/20,332.88
  6. Step 6: Final answer
    x = 19,341.89

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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.