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Finding the Fourth Proportional to 139,681.60, 192,756.90 and 76,018.03

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Solution

The fourth proportional to 139,681.60, 192,756.90 and 76,018.03 is: 104,902.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,681.60 : 192,756.90 = 76,018.03 : x
  2. Step 2: Convert to fraction form
    139,681.60/192,756.90 = 76,018.03/x
  3. Step 3: Cross multiply
    139,681.60x = 192,756.90 × 76,018.03
  4. Step 4: Simplify right side
    139,681.60x = 14,652,999,806.91
  5. Step 5: Solve for x
    x = 14,652,999,806.91/139,681.60
  6. Step 6: Final answer
    x = 104,902.86

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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.