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Finding the Fourth Proportional to 78,699.20, 118,048.80 and 72,737.60

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Solution

The fourth proportional to 78,699.20, 118,048.80 and 72,737.60 is: 109,106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.20 : 118,048.80 = 72,737.60 : x
  2. Step 2: Convert to fraction form
    78,699.20/118,048.80 = 72,737.60/x
  3. Step 3: Cross multiply
    78,699.20x = 118,048.80 × 72,737.60
  4. Step 4: Simplify right side
    78,699.20x = 8,586,586,394.88
  5. Step 5: Solve for x
    x = 8,586,586,394.88/78,699.20
  6. Step 6: Final answer
    x = 109,106.40

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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.