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Finding the Fourth Proportional to 511,260.80, 766,891.20 and 421,059.20

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Solution

The fourth proportional to 511,260.80, 766,891.20 and 421,059.20 is: 631,588.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,260.80 : 766,891.20 = 421,059.20 : x
  2. Step 2: Convert to fraction form
    511,260.80/766,891.20 = 421,059.20/x
  3. Step 3: Cross multiply
    511,260.80x = 766,891.20 × 421,059.20
  4. Step 4: Simplify right side
    511,260.80x = 322,906,595,159.04
  5. Step 5: Solve for x
    x = 322,906,595,159.04/511,260.80
  6. Step 6: Final answer
    x = 631,588.80

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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.