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Finding the Fourth Proportional to 114,612.72, 158,239.32 and 78,791.28

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Solution

The fourth proportional to 114,612.72, 158,239.32 and 78,791.28 is: 108,782.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,612.72 : 158,239.32 = 78,791.28 : x
  2. Step 2: Convert to fraction form
    114,612.72/158,239.32 = 78,791.28/x
  3. Step 3: Cross multiply
    114,612.72x = 158,239.32 × 78,791.28
  4. Step 4: Simplify right side
    114,612.72x = 12,467,878,569.13
  5. Step 5: Solve for x
    x = 12,467,878,569.13/114,612.72
  6. Step 6: Final answer
    x = 108,782.68

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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.