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Finding the Fourth Proportional to 660,132.40, 990,198.60 and 280,955.20

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Solution

The fourth proportional to 660,132.40, 990,198.60 and 280,955.20 is: 421,432.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,132.40 : 990,198.60 = 280,955.20 : x
  2. Step 2: Convert to fraction form
    660,132.40/990,198.60 = 280,955.20/x
  3. Step 3: Cross multiply
    660,132.40x = 990,198.60 × 280,955.20
  4. Step 4: Simplify right side
    660,132.40x = 278,201,445,702.72
  5. Step 5: Solve for x
    x = 278,201,445,702.72/660,132.40
  6. Step 6: Final answer
    x = 421,432.80

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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.