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Finding the Fourth Proportional to 72,940.98, 100,654.66 and 40,678.91

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Solution

The fourth proportional to 72,940.98, 100,654.66 and 40,678.91 is: 56,134.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,940.98 : 100,654.66 = 40,678.91 : x
  2. Step 2: Convert to fraction form
    72,940.98/100,654.66 = 40,678.91/x
  3. Step 3: Cross multiply
    72,940.98x = 100,654.66 × 40,678.91
  4. Step 4: Simplify right side
    72,940.98x = 4,094,521,837.46
  5. Step 5: Solve for x
    x = 4,094,521,837.46/72,940.98
  6. Step 6: Final answer
    x = 56,134.72

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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.