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Finding the Fourth Proportional to 77,991.72, 117,145.80 and 68,838.72

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Solution

The fourth proportional to 77,991.72, 117,145.80 and 68,838.72 is: 103,397.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,991.72 : 117,145.80 = 68,838.72 : x
  2. Step 2: Convert to fraction form
    77,991.72/117,145.80 = 68,838.72/x
  3. Step 3: Cross multiply
    77,991.72x = 117,145.80 × 68,838.72
  4. Step 4: Simplify right side
    77,991.72x = 8,064,166,925.38
  5. Step 5: Solve for x
    x = 8,064,166,925.38/77,991.72
  6. Step 6: Final answer
    x = 103,397.73

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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.