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Finding the Fourth Proportional to 139,140.66, 192,014.16 and 78,710.01

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Solution

The fourth proportional to 139,140.66, 192,014.16 and 78,710.01 is: 108,619.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,140.66 : 192,014.16 = 78,710.01 : x
  2. Step 2: Convert to fraction form
    139,140.66/192,014.16 = 78,710.01/x
  3. Step 3: Cross multiply
    139,140.66x = 192,014.16 × 78,710.01
  4. Step 4: Simplify right side
    139,140.66x = 15,113,436,453.74
  5. Step 5: Solve for x
    x = 15,113,436,453.74/139,140.66
  6. Step 6: Final answer
    x = 108,619.84

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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.