Home / 131,428.20-197,142.30-78,810.60

Finding the Fourth Proportional to 131,428.20, 197,142.30 and 78,810.60

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Solution

The fourth proportional to 131,428.20, 197,142.30 and 78,810.60 is: 118,215.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,428.20 : 197,142.30 = 78,810.60 : x
  2. Step 2: Convert to fraction form
    131,428.20/197,142.30 = 78,810.60/x
  3. Step 3: Cross multiply
    131,428.20x = 197,142.30 × 78,810.60
  4. Step 4: Simplify right side
    131,428.20x = 15,536,902,948.38
  5. Step 5: Solve for x
    x = 15,536,902,948.38/131,428.20
  6. Step 6: Final answer
    x = 118,215.90

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1.5x scale

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.