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Finding the Fourth Proportional to 135,422.42, 186,880.64 and 74,991.76

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Solution

The fourth proportional to 135,422.42, 186,880.64 and 74,991.76 is: 103,487.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,422.42 : 186,880.64 = 74,991.76 : x
  2. Step 2: Convert to fraction form
    135,422.42/186,880.64 = 74,991.76/x
  3. Step 3: Cross multiply
    135,422.42x = 186,880.64 × 74,991.76
  4. Step 4: Simplify right side
    135,422.42x = 14,014,508,103.53
  5. Step 5: Solve for x
    x = 14,014,508,103.53/135,422.42
  6. Step 6: Final answer
    x = 103,487.36

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1.5x scale

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.