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Finding the Fourth Proportional to 78,478.74, 108,341.99 and 62,996.81

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Solution

The fourth proportional to 78,478.74, 108,341.99 and 62,996.81 is: 86,968.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,478.74 : 108,341.99 = 62,996.81 : x
  2. Step 2: Convert to fraction form
    78,478.74/108,341.99 = 62,996.81/x
  3. Step 3: Cross multiply
    78,478.74x = 108,341.99 × 62,996.81
  4. Step 4: Simplify right side
    78,478.74x = 6,825,198,902.36
  5. Step 5: Solve for x
    x = 6,825,198,902.36/78,478.74
  6. Step 6: Final answer
    x = 86,968.76

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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.