Home / 131,419.20-197,128.80-78,801.60

Finding the Fourth Proportional to 131,419.20, 197,128.80 and 78,801.60

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Solution

The fourth proportional to 131,419.20, 197,128.80 and 78,801.60 is: 118,202.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,419.20 : 197,128.80 = 78,801.60 : x
  2. Step 2: Convert to fraction form
    131,419.20/197,128.80 = 78,801.60/x
  3. Step 3: Cross multiply
    131,419.20x = 197,128.80 × 78,801.60
  4. Step 4: Simplify right side
    131,419.20x = 15,534,064,846.08
  5. Step 5: Solve for x
    x = 15,534,064,846.08/131,419.20
  6. Step 6: Final answer
    x = 118,202.40

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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.