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Finding the Fourth Proportional to 139,870.36, 193,020.98 and 76,208.68

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Solution

The fourth proportional to 139,870.36, 193,020.98 and 76,208.68 is: 105,167.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,870.36 : 193,020.98 = 76,208.68 : x
  2. Step 2: Convert to fraction form
    139,870.36/193,020.98 = 76,208.68/x
  3. Step 3: Cross multiply
    139,870.36x = 193,020.98 × 76,208.68
  4. Step 4: Simplify right side
    139,870.36x = 14,709,874,098.11
  5. Step 5: Solve for x
    x = 14,709,874,098.11/139,870.36
  6. Step 6: Final answer
    x = 105,167.91

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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.