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Finding the Fourth Proportional to 340,028.80, 510,043.20 and 280,931.20

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Solution

The fourth proportional to 340,028.80, 510,043.20 and 280,931.20 is: 421,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    340,028.80 : 510,043.20 = 280,931.20 : x
  2. Step 2: Convert to fraction form
    340,028.80/510,043.20 = 280,931.20/x
  3. Step 3: Cross multiply
    340,028.80x = 510,043.20 × 280,931.20
  4. Step 4: Simplify right side
    340,028.80x = 143,287,048,227.84
  5. Step 5: Solve for x
    x = 143,287,048,227.84/340,028.80
  6. Step 6: Final answer
    x = 421,396.80

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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.