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Finding the Fourth Proportional to 78,549.39, 108,394.92 and 42,739.47

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Solution

The fourth proportional to 78,549.39, 108,394.92 and 42,739.47 is: 58,978.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,549.39 : 108,394.92 = 42,739.47 : x
  2. Step 2: Convert to fraction form
    78,549.39/108,394.92 = 42,739.47/x
  3. Step 3: Cross multiply
    78,549.39x = 108,394.92 × 42,739.47
  4. Step 4: Simplify right side
    78,549.39x = 4,632,741,431.49
  5. Step 5: Solve for x
    x = 4,632,741,431.49/78,549.39
  6. Step 6: Final answer
    x = 58,978.71

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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.