Home / 142,143.89-196,161.63-78,485.72

Finding the Fourth Proportional to 142,143.89, 196,161.63 and 78,485.72

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Solution

The fourth proportional to 142,143.89, 196,161.63 and 78,485.72 is: 108,311.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,143.89 : 196,161.63 = 78,485.72 : x
  2. Step 2: Convert to fraction form
    142,143.89/196,161.63 = 78,485.72/x
  3. Step 3: Cross multiply
    142,143.89x = 196,161.63 × 78,485.72
  4. Step 4: Simplify right side
    142,143.89x = 15,395,886,766.92
  5. Step 5: Solve for x
    x = 15,395,886,766.92/142,143.89
  6. Step 6: Final answer
    x = 108,311.98

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1.5x scale

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.