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Finding the Fourth Proportional to 78,359.94, 117,539.65 and 28,439.97

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Solution

The fourth proportional to 78,359.94, 117,539.65 and 28,439.97 is: 42,659.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,359.94 : 117,539.65 = 28,439.97 : x
  2. Step 2: Convert to fraction form
    78,359.94/117,539.65 = 28,439.97/x
  3. Step 3: Cross multiply
    78,359.94x = 117,539.65 × 28,439.97
  4. Step 4: Simplify right side
    78,359.94x = 3,342,823,861.51
  5. Step 5: Solve for x
    x = 3,342,823,861.51/78,359.94
  6. Step 6: Final answer
    x = 42,659.86

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1.5x scale

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.