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Finding the Fourth Proportional to 72,376.80, 108,500.40 and 47,428.80

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Solution

The fourth proportional to 72,376.80, 108,500.40 and 47,428.80 is: 71,100.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,376.80 : 108,500.40 = 47,428.80 : x
  2. Step 2: Convert to fraction form
    72,376.80/108,500.40 = 47,428.80/x
  3. Step 3: Cross multiply
    72,376.80x = 108,500.40 × 47,428.80
  4. Step 4: Simplify right side
    72,376.80x = 5,146,043,771.52
  5. Step 5: Solve for x
    x = 5,146,043,771.52/72,376.80
  6. Step 6: Final answer
    x = 71,100.74

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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.