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Finding the Fourth Proportional to 99,620.40, 149,430.60 and 47,132.40

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Solution

The fourth proportional to 99,620.40, 149,430.60 and 47,132.40 is: 70,698.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,620.40 : 149,430.60 = 47,132.40 : x
  2. Step 2: Convert to fraction form
    99,620.40/149,430.60 = 47,132.40/x
  3. Step 3: Cross multiply
    99,620.40x = 149,430.60 × 47,132.40
  4. Step 4: Simplify right side
    99,620.40x = 7,043,022,811.44
  5. Step 5: Solve for x
    x = 7,043,022,811.44/99,620.40
  6. Step 6: Final answer
    x = 70,698.60

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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.