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Finding the Fourth Proportional to 138,724.60, 208,086.90 and 59,992.60

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Solution

The fourth proportional to 138,724.60, 208,086.90 and 59,992.60 is: 89,988.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,724.60 : 208,086.90 = 59,992.60 : x
  2. Step 2: Convert to fraction form
    138,724.60/208,086.90 = 59,992.60/x
  3. Step 3: Cross multiply
    138,724.60x = 208,086.90 × 59,992.60
  4. Step 4: Simplify right side
    138,724.60x = 12,483,674,156.94
  5. Step 5: Solve for x
    x = 12,483,674,156.94/138,724.60
  6. Step 6: Final answer
    x = 89,988.90

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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.