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Finding the Fourth Proportional to 1,021.95, 1,533.80 and 406.09

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Solution

The fourth proportional to 1,021.95, 1,533.80 and 406.09 is: 609.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.95 : 1,533.80 = 406.09 : x
  2. Step 2: Convert to fraction form
    1,021.95/1,533.80 = 406.09/x
  3. Step 3: Cross multiply
    1,021.95x = 1,533.80 × 406.09
  4. Step 4: Simplify right side
    1,021.95x = 622,862.74
  5. Step 5: Solve for x
    x = 622,862.74/1,021.95
  6. Step 6: Final answer
    x = 609.48

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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.