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Finding the Fourth Proportional to 643,900.80, 965,851.20 and 328,972.80

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Solution

The fourth proportional to 643,900.80, 965,851.20 and 328,972.80 is: 493,459.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,900.80 : 965,851.20 = 328,972.80 : x
  2. Step 2: Convert to fraction form
    643,900.80/965,851.20 = 328,972.80/x
  3. Step 3: Cross multiply
    643,900.80x = 965,851.20 × 328,972.80
  4. Step 4: Simplify right side
    643,900.80x = 317,738,773,647.36
  5. Step 5: Solve for x
    x = 317,738,773,647.36/643,900.80
  6. Step 6: Final answer
    x = 493,459.20

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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.