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Finding the Fourth Proportional to 139,318.64, 192,359.88 and 85,675.76

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Solution

The fourth proportional to 139,318.64, 192,359.88 and 85,675.76 is: 118,294.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,318.64 : 192,359.88 = 85,675.76 : x
  2. Step 2: Convert to fraction form
    139,318.64/192,359.88 = 85,675.76/x
  3. Step 3: Cross multiply
    139,318.64x = 192,359.88 × 85,675.76
  4. Step 4: Simplify right side
    139,318.64x = 16,480,578,912.51
  5. Step 5: Solve for x
    x = 16,480,578,912.51/139,318.64
  6. Step 6: Final answer
    x = 118,294.14

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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.