Home / 280,715.76-421,139.64-91,175.44

Finding the Fourth Proportional to 280,715.76, 421,139.64 and 91,175.44

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Solution

The fourth proportional to 280,715.76, 421,139.64 and 91,175.44 is: 136,784.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,715.76 : 421,139.64 = 91,175.44 : x
  2. Step 2: Convert to fraction form
    280,715.76/421,139.64 = 91,175.44/x
  3. Step 3: Cross multiply
    280,715.76x = 421,139.64 × 91,175.44
  4. Step 4: Simplify right side
    280,715.76x = 38,397,591,978.44
  5. Step 5: Solve for x
    x = 38,397,591,978.44/280,715.76
  6. Step 6: Final answer
    x = 136,784.60

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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.