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Finding the Fourth Proportional to 100,509.93, 138,768.60 and 62,310.30

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Solution

The fourth proportional to 100,509.93, 138,768.60 and 62,310.30 is: 86,028.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,509.93 : 138,768.60 = 62,310.30 : x
  2. Step 2: Convert to fraction form
    100,509.93/138,768.60 = 62,310.30/x
  3. Step 3: Cross multiply
    100,509.93x = 138,768.60 × 62,310.30
  4. Step 4: Simplify right side
    100,509.93x = 8,646,713,096.58
  5. Step 5: Solve for x
    x = 8,646,713,096.58/100,509.93
  6. Step 6: Final answer
    x = 86,028.45

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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.