Home / 80,780.40-121,156.20-51,145.20

Finding the Fourth Proportional to 80,780.40, 121,156.20 and 51,145.20

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Solution

The fourth proportional to 80,780.40, 121,156.20 and 51,145.20 is: 76,708.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,780.40 : 121,156.20 = 51,145.20 : x
  2. Step 2: Convert to fraction form
    80,780.40/121,156.20 = 51,145.20/x
  3. Step 3: Cross multiply
    80,780.40x = 121,156.20 × 51,145.20
  4. Step 4: Simplify right side
    80,780.40x = 6,196,558,080.24
  5. Step 5: Solve for x
    x = 6,196,558,080.24/80,780.40
  6. Step 6: Final answer
    x = 76,708.68

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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.