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Finding the Fourth Proportional to 139,145.78, 192,021.54 and 75,483.58

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Solution

The fourth proportional to 139,145.78, 192,021.54 and 75,483.58 is: 104,167.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,145.78 : 192,021.54 = 75,483.58 : x
  2. Step 2: Convert to fraction form
    139,145.78/192,021.54 = 75,483.58/x
  3. Step 3: Cross multiply
    139,145.78x = 192,021.54 × 75,483.58
  4. Step 4: Simplify right side
    139,145.78x = 14,494,472,316.21
  5. Step 5: Solve for x
    x = 14,494,472,316.21/139,145.78
  6. Step 6: Final answer
    x = 104,167.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.