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Finding the Fourth Proportional to 135,409.99, 186,863.50 and 74,979.33

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Solution

The fourth proportional to 135,409.99, 186,863.50 and 74,979.33 is: 103,470.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,409.99 : 186,863.50 = 74,979.33 : x
  2. Step 2: Convert to fraction form
    135,409.99/186,863.50 = 74,979.33/x
  3. Step 3: Cross multiply
    135,409.99x = 186,863.50 × 74,979.33
  4. Step 4: Simplify right side
    135,409.99x = 14,010,900,031.46
  5. Step 5: Solve for x
    x = 14,010,900,031.46/135,409.99
  6. Step 6: Final answer
    x = 103,470.21

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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.