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Finding the Fourth Proportional to 342,243.76, 513,003.60 and 128,919.36

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Solution

The fourth proportional to 342,243.76, 513,003.60 and 128,919.36 is: 193,242.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,243.76 : 513,003.60 = 128,919.36 : x
  2. Step 2: Convert to fraction form
    342,243.76/513,003.60 = 128,919.36/x
  3. Step 3: Cross multiply
    342,243.76x = 513,003.60 × 128,919.36
  4. Step 4: Simplify right side
    342,243.76x = 66,136,095,789.70
  5. Step 5: Solve for x
    x = 66,136,095,789.70/342,243.76
  6. Step 6: Final answer
    x = 193,242.66

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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.