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Finding the Fourth Proportional to 511,418.80, 767,128.20 and 137,479.60

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Solution

The fourth proportional to 511,418.80, 767,128.20 and 137,479.60 is: 206,219.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,418.80 : 767,128.20 = 137,479.60 : x
  2. Step 2: Convert to fraction form
    511,418.80/767,128.20 = 137,479.60/x
  3. Step 3: Cross multiply
    511,418.80x = 767,128.20 × 137,479.60
  4. Step 4: Simplify right side
    511,418.80x = 105,464,478,084.72
  5. Step 5: Solve for x
    x = 105,464,478,084.72/511,418.80
  6. Step 6: Final answer
    x = 206,219.40

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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.