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Finding the Fourth Proportional to 138,647.81, 191,334.03 and 74,985.62

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Solution

The fourth proportional to 138,647.81, 191,334.03 and 74,985.62 is: 103,480.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,647.81 : 191,334.03 = 74,985.62 : x
  2. Step 2: Convert to fraction form
    138,647.81/191,334.03 = 74,985.62/x
  3. Step 3: Cross multiply
    138,647.81x = 191,334.03 × 74,985.62
  4. Step 4: Simplify right side
    138,647.81x = 14,347,300,866.65
  5. Step 5: Solve for x
    x = 14,347,300,866.65/138,647.81
  6. Step 6: Final answer
    x = 103,480.18

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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.