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Finding the Fourth Proportional to 78,912.40, 118,267.80 and 32,112.40

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Solution

The fourth proportional to 78,912.40, 118,267.80 and 32,112.40 is: 48,127.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,912.40 : 118,267.80 = 32,112.40 : x
  2. Step 2: Convert to fraction form
    78,912.40/118,267.80 = 32,112.40/x
  3. Step 3: Cross multiply
    78,912.40x = 118,267.80 × 32,112.40
  4. Step 4: Simplify right side
    78,912.40x = 3,797,862,900.72
  5. Step 5: Solve for x
    x = 3,797,862,900.72/78,912.40
  6. Step 6: Final answer
    x = 48,127.58

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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.