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Finding the Fourth Proportional to 139,956.20, 210,007.20 and 61,078.40

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Solution

The fourth proportional to 139,956.20, 210,007.20 and 61,078.40 is: 91,649.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,956.20 : 210,007.20 = 61,078.40 : x
  2. Step 2: Convert to fraction form
    139,956.20/210,007.20 = 61,078.40/x
  3. Step 3: Cross multiply
    139,956.20x = 210,007.20 × 61,078.40
  4. Step 4: Simplify right side
    139,956.20x = 12,826,903,764.48
  5. Step 5: Solve for x
    x = 12,826,903,764.48/139,956.20
  6. Step 6: Final answer
    x = 91,649.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.