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Finding the Fourth Proportional to 72,503.45, 108,787.40 and 28,133.63

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Solution

The fourth proportional to 72,503.45, 108,787.40 and 28,133.63 is: 42,212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,503.45 : 108,787.40 = 28,133.63 : x
  2. Step 2: Convert to fraction form
    72,503.45/108,787.40 = 28,133.63/x
  3. Step 3: Cross multiply
    72,503.45x = 108,787.40 × 28,133.63
  4. Step 4: Simplify right side
    72,503.45x = 3,060,584,447.36
  5. Step 5: Solve for x
    x = 3,060,584,447.36/72,503.45
  6. Step 6: Final answer
    x = 42,212.95

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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.