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Finding the Fourth Proportional to 628.67, 867.71 and 407.68

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Solution

The fourth proportional to 628.67, 867.71 and 407.68 is: 562.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.67 : 867.71 = 407.68 : x
  2. Step 2: Convert to fraction form
    628.67/867.71 = 407.68/x
  3. Step 3: Cross multiply
    628.67x = 867.71 × 407.68
  4. Step 4: Simplify right side
    628.67x = 353,748.01
  5. Step 5: Solve for x
    x = 353,748.01/628.67
  6. Step 6: Final answer
    x = 562.69

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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.