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Finding the Fourth Proportional to 1,021.79, 1,410.16 and 579.77

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Solution

The fourth proportional to 1,021.79, 1,410.16 and 579.77 is: 800.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.79 : 1,410.16 = 579.77 : x
  2. Step 2: Convert to fraction form
    1,021.79/1,410.16 = 579.77/x
  3. Step 3: Cross multiply
    1,021.79x = 1,410.16 × 579.77
  4. Step 4: Simplify right side
    1,021.79x = 817,568.46
  5. Step 5: Solve for x
    x = 817,568.46/1,021.79
  6. Step 6: Final answer
    x = 800.13

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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.