Home / 78,689.05-108,589.47-42,879.35

Finding the Fourth Proportional to 78,689.05, 108,589.47 and 42,879.35

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Solution

The fourth proportional to 78,689.05, 108,589.47 and 42,879.35 is: 59,172.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,689.05 : 108,589.47 = 42,879.35 : x
  2. Step 2: Convert to fraction form
    78,689.05/108,589.47 = 42,879.35/x
  3. Step 3: Cross multiply
    78,689.05x = 108,589.47 × 42,879.35
  4. Step 4: Simplify right side
    78,689.05x = 4,656,245,890.44
  5. Step 5: Solve for x
    x = 4,656,245,890.44/78,689.05
  6. Step 6: Final answer
    x = 59,172.73

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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.