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Finding the Fourth Proportional to 103,626.40, 155,439.60 and 78,743.20

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Solution

The fourth proportional to 103,626.40, 155,439.60 and 78,743.20 is: 118,114.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,626.40 : 155,439.60 = 78,743.20 : x
  2. Step 2: Convert to fraction form
    103,626.40/155,439.60 = 78,743.20/x
  3. Step 3: Cross multiply
    103,626.40x = 155,439.60 × 78,743.20
  4. Step 4: Simplify right side
    103,626.40x = 12,239,811,510.72
  5. Step 5: Solve for x
    x = 12,239,811,510.72/103,626.40
  6. Step 6: Final answer
    x = 118,114.80

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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.