Home / 78,628.10-117,990.75-31,881.38

Finding the Fourth Proportional to 78,628.10, 117,990.75 and 31,881.38

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Solution

The fourth proportional to 78,628.10, 117,990.75 and 31,881.38 is: 47,841.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,628.10 : 117,990.75 = 31,881.38 : x
  2. Step 2: Convert to fraction form
    78,628.10/117,990.75 = 31,881.38/x
  3. Step 3: Cross multiply
    78,628.10x = 117,990.75 × 31,881.38
  4. Step 4: Simplify right side
    78,628.10x = 3,761,707,937.24
  5. Step 5: Solve for x
    x = 3,761,707,937.24/78,628.10
  6. Step 6: Final answer
    x = 47,841.78

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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.