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Finding the Fourth Proportional to 139,313.92, 192,254.16 and 81,987.52

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Solution

The fourth proportional to 139,313.92, 192,254.16 and 81,987.52 is: 113,143.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,313.92 : 192,254.16 = 81,987.52 : x
  2. Step 2: Convert to fraction form
    139,313.92/192,254.16 = 81,987.52/x
  3. Step 3: Cross multiply
    139,313.92x = 192,254.16 × 81,987.52
  4. Step 4: Simplify right side
    139,313.92x = 15,762,441,788.08
  5. Step 5: Solve for x
    x = 15,762,441,788.08/139,313.92
  6. Step 6: Final answer
    x = 113,143.34

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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.