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Finding the Fourth Proportional to 74,688.60, 111,903.30 and 48,379.80

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Solution

The fourth proportional to 74,688.60, 111,903.30 and 48,379.80 is: 72,485.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,688.60 : 111,903.30 = 48,379.80 : x
  2. Step 2: Convert to fraction form
    74,688.60/111,903.30 = 48,379.80/x
  3. Step 3: Cross multiply
    74,688.60x = 111,903.30 × 48,379.80
  4. Step 4: Simplify right side
    74,688.60x = 5,413,859,273.34
  5. Step 5: Solve for x
    x = 5,413,859,273.34/74,688.60
  6. Step 6: Final answer
    x = 72,485.75

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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.