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Finding the Fourth Proportional to 53,319.72, 79,979.64 and 39,478.44

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Solution

The fourth proportional to 53,319.72, 79,979.64 and 39,478.44 is: 59,217.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,319.72 : 79,979.64 = 39,478.44 : x
  2. Step 2: Convert to fraction form
    53,319.72/79,979.64 = 39,478.44/x
  3. Step 3: Cross multiply
    53,319.72x = 79,979.64 × 39,478.44
  4. Step 4: Simplify right side
    53,319.72x = 3,157,471,418.96
  5. Step 5: Solve for x
    x = 3,157,471,418.96/53,319.72
  6. Step 6: Final answer
    x = 59,217.70

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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.