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Finding the Fourth Proportional to 78,599.72, 108,464.21 and 42,789.86

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Solution

The fourth proportional to 78,599.72, 108,464.21 and 42,789.86 is: 59,048.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,599.72 : 108,464.21 = 42,789.86 : x
  2. Step 2: Convert to fraction form
    78,599.72/108,464.21 = 42,789.86/x
  3. Step 3: Cross multiply
    78,599.72x = 108,464.21 × 42,789.86
  4. Step 4: Simplify right side
    78,599.72x = 4,641,168,412.54
  5. Step 5: Solve for x
    x = 4,641,168,412.54/78,599.72
  6. Step 6: Final answer
    x = 59,048.15

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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.