Home / 142,378.13-196,485.92-78,720.03

Finding the Fourth Proportional to 142,378.13, 196,485.92 and 78,720.03

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Solution

The fourth proportional to 142,378.13, 196,485.92 and 78,720.03 is: 108,635.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,378.13 : 196,485.92 = 78,720.03 : x
  2. Step 2: Convert to fraction form
    142,378.13/196,485.92 = 78,720.03/x
  3. Step 3: Cross multiply
    142,378.13x = 196,485.92 × 78,720.03
  4. Step 4: Simplify right side
    142,378.13x = 15,467,377,123.38
  5. Step 5: Solve for x
    x = 15,467,377,123.38/142,378.13
  6. Step 6: Final answer
    x = 108,635.91

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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.