Home / 78,115.38-117,178.53-31,368.25

Finding the Fourth Proportional to 78,115.38, 117,178.53 and 31,368.25

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Solution

The fourth proportional to 78,115.38, 117,178.53 and 31,368.25 is: 47,054.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,115.38 : 117,178.53 = 31,368.25 : x
  2. Step 2: Convert to fraction form
    78,115.38/117,178.53 = 31,368.25/x
  3. Step 3: Cross multiply
    78,115.38x = 117,178.53 × 31,368.25
  4. Step 4: Simplify right side
    78,115.38x = 3,675,685,423.67
  5. Step 5: Solve for x
    x = 3,675,685,423.67/78,115.38
  6. Step 6: Final answer
    x = 47,054.57

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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.