Home / 78,115.16-117,178.25-38,661.68

Finding the Fourth Proportional to 78,115.16, 117,178.25 and 38,661.68

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Solution

The fourth proportional to 78,115.16, 117,178.25 and 38,661.68 is: 57,995.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,115.16 : 117,178.25 = 38,661.68 : x
  2. Step 2: Convert to fraction form
    78,115.16/117,178.25 = 38,661.68/x
  3. Step 3: Cross multiply
    78,115.16x = 117,178.25 × 38,661.68
  4. Step 4: Simplify right side
    78,115.16x = 4,530,307,774.53
  5. Step 5: Solve for x
    x = 4,530,307,774.53/78,115.16
  6. Step 6: Final answer
    x = 57,995.24

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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.