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Finding the Fourth Proportional to 74,761.76, 112,142.64 and 28,008.56

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Solution

The fourth proportional to 74,761.76, 112,142.64 and 28,008.56 is: 42,012.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,761.76 : 112,142.64 = 28,008.56 : x
  2. Step 2: Convert to fraction form
    74,761.76/112,142.64 = 28,008.56/x
  3. Step 3: Cross multiply
    74,761.76x = 112,142.64 × 28,008.56
  4. Step 4: Simplify right side
    74,761.76x = 3,140,953,861.00
  5. Step 5: Solve for x
    x = 3,140,953,861.00/74,761.76
  6. Step 6: Final answer
    x = 42,012.84

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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.