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Finding the Fourth Proportional to 138,636.76, 191,318.16 and 74,974.60

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Solution

The fourth proportional to 138,636.76, 191,318.16 and 74,974.60 is: 103,464.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,636.76 : 191,318.16 = 74,974.60 : x
  2. Step 2: Convert to fraction form
    138,636.76/191,318.16 = 74,974.60/x
  3. Step 3: Cross multiply
    138,636.76x = 191,318.16 × 74,974.60
  4. Step 4: Simplify right side
    138,636.76x = 14,344,002,518.74
  5. Step 5: Solve for x
    x = 14,344,002,518.74/138,636.76
  6. Step 6: Final answer
    x = 103,464.64

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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.