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Finding the Fourth Proportional to 139,620.60, 209,430.90 and 100,254.60

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Solution

The fourth proportional to 139,620.60, 209,430.90 and 100,254.60 is: 150,381.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,620.60 : 209,430.90 = 100,254.60 : x
  2. Step 2: Convert to fraction form
    139,620.60/209,430.90 = 100,254.60/x
  3. Step 3: Cross multiply
    139,620.60x = 209,430.90 × 100,254.60
  4. Step 4: Simplify right side
    139,620.60x = 20,996,411,107.14
  5. Step 5: Solve for x
    x = 20,996,411,107.14/139,620.60
  6. Step 6: Final answer
    x = 150,381.90

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1.5x scale

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.