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Finding the Fourth Proportional to 131,436.80, 197,155.20 and 78,819.20

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Solution

The fourth proportional to 131,436.80, 197,155.20 and 78,819.20 is: 118,228.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,436.80 : 197,155.20 = 78,819.20 : x
  2. Step 2: Convert to fraction form
    131,436.80/197,155.20 = 78,819.20/x
  3. Step 3: Cross multiply
    131,436.80x = 197,155.20 × 78,819.20
  4. Step 4: Simplify right side
    131,436.80x = 15,539,615,139.84
  5. Step 5: Solve for x
    x = 15,539,615,139.84/131,436.80
  6. Step 6: Final answer
    x = 118,228.80

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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.