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Finding the Fourth Proportional to 28,306.80, 42,503.40 and 21,740.40

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Solution

The fourth proportional to 28,306.80, 42,503.40 and 21,740.40 is: 32,643.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,306.80 : 42,503.40 = 21,740.40 : x
  2. Step 2: Convert to fraction form
    28,306.80/42,503.40 = 21,740.40/x
  3. Step 3: Cross multiply
    28,306.80x = 42,503.40 × 21,740.40
  4. Step 4: Simplify right side
    28,306.80x = 924,040,917.36
  5. Step 5: Solve for x
    x = 924,040,917.36/28,306.80
  6. Step 6: Final answer
    x = 32,643.78

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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.