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Finding the Fourth Proportional to 139,543.40, 209,315.10 and 100,015.40

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Solution

The fourth proportional to 139,543.40, 209,315.10 and 100,015.40 is: 150,023.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,543.40 : 209,315.10 = 100,015.40 : x
  2. Step 2: Convert to fraction form
    139,543.40/209,315.10 = 100,015.40/x
  3. Step 3: Cross multiply
    139,543.40x = 209,315.10 × 100,015.40
  4. Step 4: Simplify right side
    139,543.40x = 20,934,733,452.54
  5. Step 5: Solve for x
    x = 20,934,733,452.54/139,543.40
  6. Step 6: Final answer
    x = 150,023.10

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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.