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Finding the Fourth Proportional to 140,419.40, 210,629.10 and 87,275.30

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Solution

The fourth proportional to 140,419.40, 210,629.10 and 87,275.30 is: 130,912.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,419.40 : 210,629.10 = 87,275.30 : x
  2. Step 2: Convert to fraction form
    140,419.40/210,629.10 = 87,275.30/x
  3. Step 3: Cross multiply
    140,419.40x = 210,629.10 × 87,275.30
  4. Step 4: Simplify right side
    140,419.40x = 18,382,717,891.23
  5. Step 5: Solve for x
    x = 18,382,717,891.23/140,419.40
  6. Step 6: Final answer
    x = 130,912.95

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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.