Home / 78,631.47-117,842.13-28,664.64

Finding the Fourth Proportional to 78,631.47, 117,842.13 and 28,664.64

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Solution

The fourth proportional to 78,631.47, 117,842.13 and 28,664.64 is: 42,958.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,631.47 : 117,842.13 = 28,664.64 : x
  2. Step 2: Convert to fraction form
    78,631.47/117,842.13 = 28,664.64/x
  3. Step 3: Cross multiply
    78,631.47x = 117,842.13 × 28,664.64
  4. Step 4: Simplify right side
    78,631.47x = 3,377,902,233.28
  5. Step 5: Solve for x
    x = 3,377,902,233.28/78,631.47
  6. Step 6: Final answer
    x = 42,958.66

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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.