Home / 142,439.64-196,549.65-78,768.78

Finding the Fourth Proportional to 142,439.64, 196,549.65 and 78,768.78

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Solution

The fourth proportional to 142,439.64, 196,549.65 and 78,768.78 is: 108,691.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,439.64 : 196,549.65 = 78,768.78 : x
  2. Step 2: Convert to fraction form
    142,439.64/196,549.65 = 78,768.78/x
  3. Step 3: Cross multiply
    142,439.64x = 196,549.65 × 78,768.78
  4. Step 4: Simplify right side
    142,439.64x = 15,481,976,139.93
  5. Step 5: Solve for x
    x = 15,481,976,139.93/142,439.64
  6. Step 6: Final answer
    x = 108,691.49

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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.