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Finding the Fourth Proportional to 86,424.40, 129,636.60 and 68,928.40

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Solution

The fourth proportional to 86,424.40, 129,636.60 and 68,928.40 is: 103,392.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,424.40 : 129,636.60 = 68,928.40 : x
  2. Step 2: Convert to fraction form
    86,424.40/129,636.60 = 68,928.40/x
  3. Step 3: Cross multiply
    86,424.40x = 129,636.60 × 68,928.40
  4. Step 4: Simplify right side
    86,424.40x = 8,935,643,419.44
  5. Step 5: Solve for x
    x = 8,935,643,419.44/86,424.40
  6. Step 6: Final answer
    x = 103,392.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.