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Finding the Fourth Proportional to 131,978.40, 197,391.60 and 118,039.20

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Solution

The fourth proportional to 131,978.40, 197,391.60 and 118,039.20 is: 176,543.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,978.40 : 197,391.60 = 118,039.20 : x
  2. Step 2: Convert to fraction form
    131,978.40/197,391.60 = 118,039.20/x
  3. Step 3: Cross multiply
    131,978.40x = 197,391.60 × 118,039.20
  4. Step 4: Simplify right side
    131,978.40x = 23,299,946,550.72
  5. Step 5: Solve for x
    x = 23,299,946,550.72/131,978.40
  6. Step 6: Final answer
    x = 176,543.64

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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.