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Finding the Fourth Proportional to 660,419.40, 990,629.10 and 187,098.60

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Solution

The fourth proportional to 660,419.40, 990,629.10 and 187,098.60 is: 280,647.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,419.40 : 990,629.10 = 187,098.60 : x
  2. Step 2: Convert to fraction form
    660,419.40/990,629.10 = 187,098.60/x
  3. Step 3: Cross multiply
    660,419.40x = 990,629.10 × 187,098.60
  4. Step 4: Simplify right side
    660,419.40x = 185,345,317,729.26
  5. Step 5: Solve for x
    x = 185,345,317,729.26/660,419.40
  6. Step 6: Final answer
    x = 280,647.90

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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.