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Finding the Fourth Proportional to 800,010.40, 1,200,130.80 and 426,061.60

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Solution

The fourth proportional to 800,010.40, 1,200,130.80 and 426,061.60 is: 639,153.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    800,010.40 : 1,200,130.80 = 426,061.60 : x
  2. Step 2: Convert to fraction form
    800,010.40/1,200,130.80 = 426,061.60/x
  3. Step 3: Cross multiply
    800,010.40x = 1,200,130.80 × 426,061.60
  4. Step 4: Simplify right side
    800,010.40x = 511,329,648,857.28
  5. Step 5: Solve for x
    x = 511,329,648,857.28/800,010.40
  6. Step 6: Final answer
    x = 639,153.75

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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.