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Finding the Fourth Proportional to 579.51, 869.35 and 214.21

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Solution

The fourth proportional to 579.51, 869.35 and 214.21 is: 321.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.51 : 869.35 = 214.21 : x
  2. Step 2: Convert to fraction form
    579.51/869.35 = 214.21/x
  3. Step 3: Cross multiply
    579.51x = 869.35 × 214.21
  4. Step 4: Simplify right side
    579.51x = 186,223.46
  5. Step 5: Solve for x
    x = 186,223.46/579.51
  6. Step 6: Final answer
    x = 321.35

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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.