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Finding the Fourth Proportional to 340,018.80, 510,028.20 and 280,921.20

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Solution

The fourth proportional to 340,018.80, 510,028.20 and 280,921.20 is: 421,381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    340,018.80 : 510,028.20 = 280,921.20 : x
  2. Step 2: Convert to fraction form
    340,018.80/510,028.20 = 280,921.20/x
  3. Step 3: Cross multiply
    340,018.80x = 510,028.20 × 280,921.20
  4. Step 4: Simplify right side
    340,018.80x = 143,277,733,977.84
  5. Step 5: Solve for x
    x = 143,277,733,977.84/340,018.80
  6. Step 6: Final answer
    x = 421,381.80

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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.