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Finding the Fourth Proportional to 154,388.69, 213,065.78 and 86,404.28

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Solution

The fourth proportional to 154,388.69, 213,065.78 and 86,404.28 is: 119,243.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,388.69 : 213,065.78 = 86,404.28 : x
  2. Step 2: Convert to fraction form
    154,388.69/213,065.78 = 86,404.28/x
  3. Step 3: Cross multiply
    154,388.69x = 213,065.78 × 86,404.28
  4. Step 4: Simplify right side
    154,388.69x = 18,409,793,816.19
  5. Step 5: Solve for x
    x = 18,409,793,816.19/154,388.69
  6. Step 6: Final answer
    x = 119,243.15

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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.