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Finding the Fourth Proportional to 509,929.20, 764,893.80 and 421,282.80

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Solution

The fourth proportional to 509,929.20, 764,893.80 and 421,282.80 is: 631,924.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,929.20 : 764,893.80 = 421,282.80 : x
  2. Step 2: Convert to fraction form
    509,929.20/764,893.80 = 421,282.80/x
  3. Step 3: Cross multiply
    509,929.20x = 764,893.80 × 421,282.80
  4. Step 4: Simplify right side
    509,929.20x = 322,236,601,766.64
  5. Step 5: Solve for x
    x = 322,236,601,766.64/509,929.20
  6. Step 6: Final answer
    x = 631,924.20

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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.