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Finding the Fourth Proportional to 78,388.74, 108,177.26 and 42,579.45

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Solution

The fourth proportional to 78,388.74, 108,177.26 and 42,579.45 is: 58,760.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,388.74 : 108,177.26 = 42,579.45 : x
  2. Step 2: Convert to fraction form
    78,388.74/108,177.26 = 42,579.45/x
  3. Step 3: Cross multiply
    78,388.74x = 108,177.26 × 42,579.45
  4. Step 4: Simplify right side
    78,388.74x = 4,606,128,020.41
  5. Step 5: Solve for x
    x = 4,606,128,020.41/78,388.74
  6. Step 6: Final answer
    x = 58,760.07

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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.