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Finding the Fourth Proportional to 139,988.76, 193,179.60 and 76,325.28

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Solution

The fourth proportional to 139,988.76, 193,179.60 and 76,325.28 is: 105,326.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,988.76 : 193,179.60 = 76,325.28 : x
  2. Step 2: Convert to fraction form
    139,988.76/193,179.60 = 76,325.28/x
  3. Step 3: Cross multiply
    139,988.76x = 193,179.60 × 76,325.28
  4. Step 4: Simplify right side
    139,988.76x = 14,744,487,060.29
  5. Step 5: Solve for x
    x = 14,744,487,060.29/139,988.76
  6. Step 6: Final answer
    x = 105,326.22

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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.