Home / 78,537.47-117,805.65-31,789.67

Finding the Fourth Proportional to 78,537.47, 117,805.65 and 31,789.67

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Solution

The fourth proportional to 78,537.47, 117,805.65 and 31,789.67 is: 47,684.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,537.47 : 117,805.65 = 31,789.67 : x
  2. Step 2: Convert to fraction form
    78,537.47/117,805.65 = 31,789.67/x
  3. Step 3: Cross multiply
    78,537.47x = 117,805.65 × 31,789.67
  4. Step 4: Simplify right side
    78,537.47x = 3,745,002,737.64
  5. Step 5: Solve for x
    x = 3,745,002,737.64/78,537.47
  6. Step 6: Final answer
    x = 47,684.28

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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.