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Finding the Fourth Proportional to 155,069.76, 213,970.68 and 91,419.87

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Solution

The fourth proportional to 155,069.76, 213,970.68 and 91,419.87 is: 126,144.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,069.76 : 213,970.68 = 91,419.87 : x
  2. Step 2: Convert to fraction form
    155,069.76/213,970.68 = 91,419.87/x
  3. Step 3: Cross multiply
    155,069.76x = 213,970.68 × 91,419.87
  4. Step 4: Simplify right side
    155,069.76x = 19,561,171,749.41
  5. Step 5: Solve for x
    x = 19,561,171,749.41/155,069.76
  6. Step 6: Final answer
    x = 126,144.33

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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.