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Finding the Fourth Proportional to 74,757.60, 112,047.60 and 39,679.20

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Solution

The fourth proportional to 74,757.60, 112,047.60 and 39,679.20 is: 59,471.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,757.60 : 112,047.60 = 39,679.20 : x
  2. Step 2: Convert to fraction form
    74,757.60/112,047.60 = 39,679.20/x
  3. Step 3: Cross multiply
    74,757.60x = 112,047.60 × 39,679.20
  4. Step 4: Simplify right side
    74,757.60x = 4,445,959,129.92
  5. Step 5: Solve for x
    x = 4,445,959,129.92/74,757.60
  6. Step 6: Final answer
    x = 59,471.67

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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.