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Finding the Fourth Proportional to 571,131.40, 855,877.90 and 420,193.80

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Solution

The fourth proportional to 571,131.40, 855,877.90 and 420,193.80 is: 629,688.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    571,131.40 : 855,877.90 = 420,193.80 : x
  2. Step 2: Convert to fraction form
    571,131.40/855,877.90 = 420,193.80/x
  3. Step 3: Cross multiply
    571,131.40x = 855,877.90 × 420,193.80
  4. Step 4: Simplify right side
    571,131.40x = 359,634,587,137.02
  5. Step 5: Solve for x
    x = 359,634,587,137.02/571,131.40
  6. Step 6: Final answer
    x = 629,688.00

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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.