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Finding the Fourth Proportional to 1,021.74, 1,409.90 and 579.76

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Solution

The fourth proportional to 1,021.74, 1,409.90 and 579.76 is: 800.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.74 : 1,409.90 = 579.76 : x
  2. Step 2: Convert to fraction form
    1,021.74/1,409.90 = 579.76/x
  3. Step 3: Cross multiply
    1,021.74x = 1,409.90 × 579.76
  4. Step 4: Simplify right side
    1,021.74x = 817,403.62
  5. Step 5: Solve for x
    x = 817,403.62/1,021.74
  6. Step 6: Final answer
    x = 800.01

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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.