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Finding the Fourth Proportional to 139,742.70, 209,614.05 and 127,276.80

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Solution

The fourth proportional to 139,742.70, 209,614.05 and 127,276.80 is: 190,915.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,742.70 : 209,614.05 = 127,276.80 : x
  2. Step 2: Convert to fraction form
    139,742.70/209,614.05 = 127,276.80/x
  3. Step 3: Cross multiply
    139,742.70x = 209,614.05 × 127,276.80
  4. Step 4: Simplify right side
    139,742.70x = 26,679,005,519.04
  5. Step 5: Solve for x
    x = 26,679,005,519.04/139,742.70
  6. Step 6: Final answer
    x = 190,915.20

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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.