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Finding the Fourth Proportional to 78,162.94, 117,266.28 and 31,448.62

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Solution

The fourth proportional to 78,162.94, 117,266.28 and 31,448.62 is: 47,181.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,162.94 : 117,266.28 = 31,448.62 : x
  2. Step 2: Convert to fraction form
    78,162.94/117,266.28 = 31,448.62/x
  3. Step 3: Cross multiply
    78,162.94x = 117,266.28 × 31,448.62
  4. Step 4: Simplify right side
    78,162.94x = 3,687,862,678.53
  5. Step 5: Solve for x
    x = 3,687,862,678.53/78,162.94
  6. Step 6: Final answer
    x = 47,181.73

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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.