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Finding the Fourth Proportional to 628.27, 866.18 and 515.83

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Solution

The fourth proportional to 628.27, 866.18 and 515.83 is: 711.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.27 : 866.18 = 515.83 : x
  2. Step 2: Convert to fraction form
    628.27/866.18 = 515.83/x
  3. Step 3: Cross multiply
    628.27x = 866.18 × 515.83
  4. Step 4: Simplify right side
    628.27x = 446,801.63
  5. Step 5: Solve for x
    x = 446,801.63/628.27
  6. Step 6: Final answer
    x = 711.16

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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.