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Finding the Fourth Proportional to 78,937.26, 108,930.18 and 43,128.51

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Solution

The fourth proportional to 78,937.26, 108,930.18 and 43,128.51 is: 59,515.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,937.26 : 108,930.18 = 43,128.51 : x
  2. Step 2: Convert to fraction form
    78,937.26/108,930.18 = 43,128.51/x
  3. Step 3: Cross multiply
    78,937.26x = 108,930.18 × 43,128.51
  4. Step 4: Simplify right side
    78,937.26x = 4,697,996,357.43
  5. Step 5: Solve for x
    x = 4,697,996,357.43/78,937.26
  6. Step 6: Final answer
    x = 59,515.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.