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Finding the Fourth Proportional to 139,370.40, 192,346.80 and 78,945.12

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Solution

The fourth proportional to 139,370.40, 192,346.80 and 78,945.12 is: 108,953.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,370.40 : 192,346.80 = 78,945.12 : x
  2. Step 2: Convert to fraction form
    139,370.40/192,346.80 = 78,945.12/x
  3. Step 3: Cross multiply
    139,370.40x = 192,346.80 × 78,945.12
  4. Step 4: Simplify right side
    139,370.40x = 15,184,841,207.62
  5. Step 5: Solve for x
    x = 15,184,841,207.62/139,370.40
  6. Step 6: Final answer
    x = 108,953.13

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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.