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Finding the Fourth Proportional to 131,423.60, 196,681.80 and 78,870.80

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Solution

The fourth proportional to 131,423.60, 196,681.80 and 78,870.80 is: 118,033.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,423.60 : 196,681.80 = 78,870.80 : x
  2. Step 2: Convert to fraction form
    131,423.60/196,681.80 = 78,870.80/x
  3. Step 3: Cross multiply
    131,423.60x = 196,681.80 × 78,870.80
  4. Step 4: Simplify right side
    131,423.60x = 15,512,450,911.44
  5. Step 5: Solve for x
    x = 15,512,450,911.44/131,423.60
  6. Step 6: Final answer
    x = 118,033.98

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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.