Home / 1,021.61-1,409.90-579.55

Finding the Fourth Proportional to 1,021.61, 1,409.90 and 579.55

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Solution

The fourth proportional to 1,021.61, 1,409.90 and 579.55 is: 799.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.61 : 1,409.90 = 579.55 : x
  2. Step 2: Convert to fraction form
    1,021.61/1,409.90 = 579.55/x
  3. Step 3: Cross multiply
    1,021.61x = 1,409.90 × 579.55
  4. Step 4: Simplify right side
    1,021.61x = 817,107.55
  5. Step 5: Solve for x
    x = 817,107.55/1,021.61
  6. Step 6: Final answer
    x = 799.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.