Home / 78,649.12-117,930.16-31,216.16

Finding the Fourth Proportional to 78,649.12, 117,930.16 and 31,216.16

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Solution

The fourth proportional to 78,649.12, 117,930.16 and 31,216.16 is: 46,806.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,649.12 : 117,930.16 = 31,216.16 : x
  2. Step 2: Convert to fraction form
    78,649.12/117,930.16 = 31,216.16/x
  3. Step 3: Cross multiply
    78,649.12x = 117,930.16 × 31,216.16
  4. Step 4: Simplify right side
    78,649.12x = 3,681,326,743.39
  5. Step 5: Solve for x
    x = 3,681,326,743.39/78,649.12
  6. Step 6: Final answer
    x = 46,806.97

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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.